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We no longer release numbered perpetual versions of X-Particles which require you to buy an upgrade to gain access to the latest build.
If your license begins with 'XPL' you can buy a Maintenance Agreement which provides updates automatically, as well as additional benefits. See our Maintenance product page for more information.
We no longer support X-Particles 3.5 users (as of December 31st, 2019).
You can continue to use X-Particles 3.5, but to receive maintenance, you will need to upgrade or take out an INSYDIUM Subscription. This gives you the latest build and includes Maintenance.
If you can't see the Cycles 4D Menu within Cinema 4D, check the Cinema 4D Console and if Cycles 4D isn't showing in the Console either, you will need to install some redistributable files from the following link:
https://support.microsoft.com/en-gb/help/2977003/the-latest-supported-visual-c-downloads
From there, please download and install the 2015-2019 x64 Visual C++ file (vc_redist.x64.exe).
If Cycles 4D is showing in the Console, but not the Menu then contact Technical Support.
The INSYDIUM Maintenance Agreement provides maintenance for X-Particles licenses beginning with 'XPL' and brings your Cycles 4D Maintenance Agreement in line, regardless of when your Cycles 4D Maintenance expires.
If your X-Particles license is within its Maintenance period, buying the INSYDIUM Maintenance Agreement will give you an additional 12 or 24 months cover after your existing Maintenance expires, depending on when you purchase. Your Cycles 4D Maintenance expiry date will be updated to match the new expiry date of your X-Particles Maintenance Agreement.
If you buy a new Maintenance Agreement during your Maintenance Period; before it expires, you will be able to continuously access the Maintenance benefits and 12 months will be added to your existing expiry date.
If you buy a new Maintenance Agreement after your existing Maintenance expires, you will miss out on the Maintenance benefits until you ‘reactivate’ and your new expiry date will be calculated by adding 12 or 24 months (depending on when you purchase) onto your existing expiry date, not from the date you purchased the new Maintenance Agreement.
If you forget to buy a new Maintenance Agreement within your Maintenance Period, we give you up to 12 months after your existing expiry date to buy a new one during the Reactivation Period, but you will miss out on the Maintenance benefits until you ‘reactivate’.
After the Reactivation Period, we give you a further 12-month Last Chance Period to buy a new Maintenance Agreement, but it will cost you more to cover the number of updates that have been released over the 2 years.
Buying Maintenance during the Maintenance or Reactivation Period will add 12 months to your existing expiry date. If you buy Maintenance during the Last Chance Period, 24 months will be added to your existing expiry date.
If you wait until 24 months after your Maintenance expires, you are Too Late and can no longer buy a new Maintenance Agreement for that license. The only options are to buy a new perpetual license or take out an INSYDIUM Subscription.
X-Particles (licenses beginning with XPL) and Cycles 4D do not require new licenses with a new version of Cinema 4D.
Log into your Customer Account and use the download link to access the latest build that your Maintenance Agreement entitles you to. Install it into Cinema 4D, then use your existing X-Particles/Cycles 4D license.
Every X-Particles is individually signed and registered to its owner on downloading from your Customer Account after you have purchased. This information is encoded into X-Particles. Your Customer Account stores your personal download and it should not be shared with anyone else.
If you have X-Particles installed already in Cinema 4D and have the X-Particles Updater enabled (with an internet connection), this will always give you the latest version of X-Particles available for your license.
On some Windows systems within the Cinema 4D Console, you may get a warning that some redistributable files (xpOpenVDBMesher/xpShatter) can’t load.
To fix this, please visit the following link:
https://support.microsoft.com/en-gb/help/2977003/the-latest-supported-visual-c-downloads
From there, please download and install the 2015-2019 x64 Visual C++ file (vc_redist.x64.exe).
By default, when you exit Cinema 4D your license seat is closed and your license will work offline for two days. After that it will need to reconnect with the server.
If you have a perpetual license and need to use it for a longer period offline, you can uncheck the 'Close License Seat on Exit' switch in the main preferences. In that case, the license is not closed when you exit Cinema 4D, and then you can continue to use your license for up to 14 days before needing to reconnect. While the license seat is still open you won't be able to use that license on another machine.
You can switch between these two options at any time and if you need a longer offline period please contact our Customer Services team, this period can be extended (subject to conditions).
If your license seat doesn't close by exiting Cinema 4D, it can be reset by clicking the 'Reset' button in your Customer Account.
Please note: You can only reset your license a limited number of times
Please check your client has internet access for the online licensing. X-Particles comes with unlimited render nodes but these still need to connect to our license server.
As of X-Particles 3.5 render nodes have offline support through a license key. If your render nodes do not have an internet connection, please follow the instructions shown in the Cinema 4D console.
Render farm applications use the Cinema 4D command line rendering, so yes X-Particles fully supports this with unlimited render nodes.
Our latest build is compatible with Cinema 4D R14 through to R21.
INSYDIUM licenses allow 14 days offline (2 days for subscriptions), so it should not be a problem if your internet goes down or in the unlikely event of our server going down. To add to this we run two backup license servers. If your license is unable to connect to our primary license server, it will try both of our backup servers.
INSYDIUM software licenses allow unlimited render nodes, so you do not need to buy additional licenses. Install the software to each client and ensure they have an internet connection for licensing. Your software download carries your license information encoded into it, so our license server will enable your software to run under CLR/TR/NET without the need to enter a license for them.
Please Note : This general formatting is defined by MAXON for the MAXON license server. Cinema 4D R21 does not support the Maxon license sever.
X-Particles (as of X-Particles 3) has its own license entry and licensing within X-Particles itself, your license will be requested by X-Particles on starting Cinema 4D. If you prefer to use the MAXON license server you may format the X-Particles license as follows. The below is for use with Cinema 4D versions up to R20.
X-Particles-License [{Cinema 4D Version}-0-1036107] <<XPLC4D {Cinema 4D multi-license end 5 Digits}-{X-Particles License}>>
Replacing the {..} with the information, e.g. {Cinema 4D Version} is 20 for R20 Cinema 4D serials.
Replace {X-Particles License} with your X-Particles license, starting XPL-
Replace {Cinema 4D multi-license end 5 Digits} with the last 5 digits of the first part (11 digits) of the Cinema 4D multi-license, e.g the Cinema 4D multi-license starts with a 2, so for 20701012345, the last 5 digits would be 12345.
For an R20 serial 20701012345 and X-Particles license XPL-000-000-000-000-000-000-000-000-000, the entry for the MAXON license server would be:
X-Particles-License [17-0-1036107] <<XPLC4D12345-XPL-000-000-000-000-000-000-000-000-000>>
Cycles 4D has its own license entry and licensing within Cycles 4D itself, your license will be requested by Cycles 4D on starting Cinema 4D. If you prefer to use the MAXON license server you may format the Cycles 4D license as follows. The below is for use with Cinema 4D versions up to R20.
Cycles 4D-License [{Cinema 4D Version}-0-1038271] <<CYCS4D{Cinema 4D multi-license end 5 Digits}-{Cycles 4D License}>>
Replacing the {..} with the information, e.g. {Cinema 4D Version} is 20 for R20 Cinema 4D serials.
Replace {Cycles 4D License} with your Cycles 4D license, starting CY4D-
Replace {Cinema 4D multi-license end 5 Digits} with the last 5 digits of the first part (11 digits) of the Cinema 4D multi-license, e.g the Cinema 4D multi-license starts with a 2, so for 20701012345, the last 5 digits would be 12345.
For an R20 serial 20701012345 and Cycles 4D License CY4D-000-000-000-000-000-000-000-000-000, the entry for the MAXON license server would be:
Cycles 4D-License [17-0-1038271] <<CYCS4D12345-CY4D-000-000-000-000-000-000-000-000-000>>
X-Particles licenses (as of X-Particles 3) need an internet connection at least once every two days by default (can be extended to 14 days for perpetual licenses).
If you are still having problems and have an internet connection but X-Particles won’t use it, please contact our Customer Services team. Please be aware that we can only offer suggestions and limited help finding the cause as every network and security setup is different.
We have produced a detailed PDF giving more information on troubleshooting problems with Team Render and X-Particles. Please see this PDF before contacting technical support. This can be found in the Downloads section of our site.
Yes, xpClothFX uses the X-Particles constraints system for dynamic particle-based simulations.
Yes, xpClothFX works with the FluidPDB solver for unified dynamics effects.
xpClothFX is primarily designed for motion graphics and destruction effects, however, simple clothing can be done.
Yes, the xpClothFX has built-in plastic constraints for denting.
You can utilise the xpCirclePacker to populate any object however the algorithm only works with Circles, so as long as your object fits within the radius of the circle there will be no overlap.
Yes, using the force mode all modifiers can be used.
Sure here is a default simulation running at a Voxel Size of 0.8
Yes ExplosiaFX can be exported as a VDB volume, and any engine that can read the VDB data can then render the volume data.
The FluidFX solver does not use X-Particles Substeps, it has its own in the solver. Stepping can be solved using the new Jitter X and Y option in the emission settings for the fluid particles, so space out the emission.
A brief guide to installing your INSYDIUM plugin (PRODUCT)
When a plugin is installed in Cinema 4D, there are two possible locations. The first is the plugins folder in the same place as the Cinema 4D application itself. For Windows users this is generally in C:Program Files\MAXON\CINEMA 4D. For Mac users this is generally in /Applications.
The location of the Cinema 4D application on Windows
The location of the Cinema 4D application on Mac
The other location is in the user preferences folder. MAXON recommends this location because for security reasons both Windows and OSX protect the Program Files (or Applications) folders, and you may get an unsuccessful installation if you try to install a plugin there.
The user preferences folder on Windows
The user preferences folder on Mac
1. Run Cinema 4D and open the Edit menu:
2. Click ‘Preferences’. This dialog box appears: *Note that the dialog box tells you where the user preferences folder is, and provides a handy button to open it.
3. Click the ‘Open Preferences Folder…’ button. An Explorer (Finder on OSX) window will open at that location.
4. Unzip the downloaded zip file into the plugins folder in the user preferences folder.
5. Finally – and this is very important – if you are upgrading to a new version of the PRODUCT, you must remove any existing installation. Check in BOTH the user preferences plugins folder AND in the Cinema 4D application plugins folder, and delete any other folders containing the PRODUCT. If you don’t do this, Cinema 4D will try to load the PRODUCT twice and it doesn’t like that; most probably, neither installation will run.
That’s it. Do all the above and you will have installed your PRODUCT successfully!
You can update your INSYDIUM plugin automatically through Cinema 4D or by downloading the latest build from your Customer Account.
If downloading the new build through your Customer Account, this can be installed as normal by following the installation video below:
If you update your plugin through Cinema 4D and receive an error message (see below), it means that your plugin has been installed in Program Files (Windows) or Applications (OSX), not the Cinema 4D Preferences. Please refer to the video instructions above to move your plugin to the correct folder and try again.
"Unable to write to the X-Particles folder.
Please ensure the plugin is located in the correct plugins folder.
Please see the manual for more information.
Thank you."
This error occurs for security reasons as both Windows and OSX place restrictions on what can be done in the Program Files and Applications folders.
If the update is still not working through Cinema 4D after the plugin has been moved to the correct location, please delete your current installation and download the new build from your Customer Account. This can then be installed by following the above video instructions.
NOTE: Updated builds are only available for licenses within their Maintenance Period.
Yes we offer discounts on some of our products for full-time students and teachers in educational institutions by using an educational coupon code.
You will need to prove your academic status before you are given access to your license/product.
All orders placed using an educational coupon code will only be processed after we receive proof of your academic status.
To send your proof, contact our Sales team and attach one of the following:
After submitting your proof of academic status, please allow up to 3 working days for your order to complete.
Please note: Proof of academic status must be in the same name as the license is to be registered to and if purchasing as a teacher, the license must be registered to your academic email address.
Licenses bought using an educational discount should not be used for commercial work.
X-Particles
We offer 50% discount on X-Particles products (excluding subscriptions) by adding the coupon code ACADEMIC in the shopping cart.
This can be used against the following products:
X-Particles Learning Edition
We offer 90% discount on X-Particles perpetual licenses by adding the coupon code STUDENT in the shopping cart.
This is for a Learning Edition of X-Particles and can only be used with the free Cinema 4D Educational License, as it saves in its own file format.
Cycles 4D
We offer 30% discount on Cycles 4D (excluding subscriptions) by adding the coupon code CYCEDU in the shopping cart.
This can be used against the following products:
You can find this information in your X-Particles and Cycles 4D License Managers inside Cinema 4D.
X-Particles menu > Help and Support > X-Particles License Manager.
Cycles 4D menu > License Manager.
You can also find your Maintenance expiry date in your Customer Account.
1. The Customer Account can be located under 'My Account' on the website.
2. If you have previously made an account – log in here. (Be sure to use the email address your license is registered to.)
3. If you bought your license with a guest account, you’ll need to register as a new customer. *Remember to use the email address your license is registered to.
4. Fill in the form to register for your account.
5. Continue to log in.
6. Log in when you need and navigate using the 'My Account' drop down.
7. Access exclusive Maintenance Training videos through your My Account menu or the Support menu.
Or through the ‘My Maintenance Agreement’ panel in your Customer Account.
8. Whilst logged in, you can also access additional Content Repository files and Technical Support from the Community and Help menus.
9. If you have bought any other products from INSYDIUM, you can also access them from your Customer Account.
No, only X-Particles licenses beginning with 'XPL' or Cycles 4D licenses can be added to your Customer Account.
Your license is registered to a specific email address. Your Customer Account must use the same email address that your license is registered to.
One change to your email address is permitted for free through your Customer Account; subsequent changes incur a fee.
No. In order to add licenses, they must be registered to the same email address as your Customer Account.
The exclusive Maintenance Training videos are only available if you are in your Maintenance Period. Please check the expiry date of your Maintenance Agreement either from your Customer Account or your Cinema 4D License Manager. If you are within your Maintenance Period and still cannot access the Maintenance Training videos, contact Customer Services.
Please login to your Customer Account and reset your license from there; this option is only available if you are in your Maintenance Period.
Customer Accounts were only introduced recently. If you chose to checkout as a guest when you made your purchase or you bought from a reseller, you will not have one but you can register for a Customer Account.
You may not have a Customer Account. Your license is registered to a specific email address and you may need to create a Customer Account using the same email address that your license is registered to.
Please add your licenses manually. Your Customer Account must use the same email address that your license is registered to.
When you buy a perpetual product license, you will receive a digital download of the latest build; this is a lifetime license for that version – it’s yours to keep and will work with a compatible version of Cinema 4D. A perpetual license is purchased as a single payment as follows:
| INSYDIUM Bundle | £700* |
| X-Particles | £590* |
| Cycles 4D | £210* |
A perpetual license comes with a 12-month Maintenance Agreement which includes many benefits, accessible when logged into your Customer Account:
• Updates
• Access to Technical Support
• Ability to join our Early Access
• Maintenance Training videos
• Additional Content Repository files
After 12 months, your Maintenance expires and a new Maintenance Agreement needs to be purchased to continue accessing Maintenance benefits.
For more information on Maintenance Agreements, visit our Maintenance product page.
*Prices shown in GBP, ex VAT. Pricing is available in Euro or USD, just select your chosen currency at checkout.
A perpetual license comes with a 12-month Maintenance Agreement. When you buy a new Maintenance Agreement you will assign it to your existing perpetual license.
Having a Maintenance Agreement allows you to access many benefits when logged into your Customer Account:
For more information on Maintenance Agreements, visit our Maintenance product page.
To cancel your INSYDIUM Subscription:
Please note: In order to avoid the next subscription fee payment, you must cancel your INSYDIUM Subscription one day before your next payment is due to be collected. If you cancel after the payment has been taken, you will receive the following subscription term as your final term. There are no refunds for the days leading up to your subscription end date.
To discuss purchasing licenses in bulk, contact our Sales Team.
If the following error message (or similar) appears when trying to open Cinema 4D with INSYDIUM plugins installed for the first time, follow the instructions below:
Press 'Cancel' on the error message.
Open Mac System Preferences > Security & Privacy. At this point, you may have to enter your password to see available options. Ensure that 'App Store and identified developers' is selected and click the 'Allow Anyway' button.
Cinema 4D will then open, but the plugins will not show in the Menu. Close Cinema 4D and re-open. The below dialog will pop up:
Click 'Open' and Cinema 4D should now load with the plugin appearing in the menu.
Please note on rare occasions, you may need to complete the above steps more than once.
Particle FX is available on demand only and is not available to download.
There are 6 chapters in the Particle FX Premium Training:
No, Particle FX is available to buy as a set of 6 chapters only.
We recommend Cinema 4D R20 and X-Particles build 724 or above because some of the effects demonstrated use newer features, however if you have previous versions/builds (Cinema 4D R16/X-Particles 642 or above), the same effects can be achieved with alternative techniques.
We also recommend that you have Cycles 4D (build 321 or above), or other render engine, and Adobe After Effects.
Particle FX Premium Training is suitable for customers with basic particle knowledge. Intermediate level and advanced X-Particles users will also benefit from the in-depth level of detail throughout the series.
Particle FX Premium Training is more in-depth than the Maintenance Training and includes over 26 hours of training – over 16 hours of pure X-Particles training and 10 hours of extra training, covering rendering and compositing. It is a scene-based series, and the skills you learn are easily transferable to your personal projects.
Each chapter contains comprehensive file downloads with everything you'll need to follow along, including: Cinema 4D scene files, materials and textures, models, baked alembics and Cycles 4D group nodes.
Particle FX contains over 16 hours of pure X-Particles Training and 10 hours of additional free training, covering rendering & compositing. Although we use Cycles 4D as our chosen rendering tool, the techniques used are transferable to your preferred render engine.
To find your X-Particles build number, within Cinema 4D, go to: X-Particles > Online Updater. Your build number is at the top of the window.
To find your Cycles 4D build number, within Cinema 4D, go to: Cycles 4D > Updater. Your build number is at the top of the window.
When logged into your Customer Account, the Particle FX Premium Training scene files can be found within each chapter underneath all the videos. Click the 'Download' link to access the files.
When you have bought Particle FX Premium Training, log into your Customer Account to access the videos.
You can then either:
Access them from your Customer Account, there is a button within a yellow box:
or
Go to Products > Premium Training from the main website navigation bar:
If you wait until 24 months after your current Maintenance expires you are Too Late and you can no longer buy a new Maintenance Agreement for your license. The only options are to buy a new perpetual license or take out an INSYDIUM Subscription.
When you buy a perpetual license it comes with a 12-month Maintenance Agreement which includes many benefits, accessible when logged into your Customer Account.
After 12 months, your Maintenance Agreement expires, your perpetual license will still be valid, but you will no longer receive the benefits included with Maintenance. A new Maintenance Agreement needs to be purchased to continue accessing Maintenance benefits.
To continuously access Maintenance benefits, you should buy a new Maintenance Agreement before it expires, during your Maintenance Period.
After expiry, we give you up to 12 months to buy a new Maintenance Agreement during the Reactivation Period, but you will miss out on the Maintenance benefits until you ‘reactivate’.
After the Reactivation Period, we give you a further 12-month Last Chance Period to buy a new Maintenance Agreement, but it will cost you more to cover the number of updates that have been released over the 2 years.
Buying Maintenance during the Maintenance or Reactivation Period will add 12 months to your existing expiry date. If you buy Maintenance during the Last Chance Period, 24 months will be added to your existing expiry date.
If you wait until 24 months after your Maintenance expires, you are Too Late and can no longer buy a new Maintenance Agreement for that license. The only options are to buy a new perpetual license or take out an INSYDIUM Subscription.
Maintenance Agreement Costs:
| X-Particles | Cycles 4D | INSYDIUM | |
| Maintenance Period | £180 | £90 | £230 |
| Reactivation Period | £180 | £90 | £230 |
| Last Chance Period | £380 | £190 | £510 |
| Too Late | |||
| New perpetual license | £590 | £210 | £700 |
| Monthly Subscription | £39/month | ||
| Annual Subscription | £312/year | ||
Prices shown in GBP, ex VAT. Pricing is available in Euro or USD, just select your chosen currency at checkout.
An INSYDIUM Monthly Subscription provides both X-Particles and Cycles 4D licenses on a monthly basis at £39* per month. Once your initial one-month term has ended, the subscription will automatically continue on a monthly basis unless you cancel before your next term starts.
Benefits:
Please Note: In the event you cancel your subscription, reverse or fail to pay your subscription fee payment, the licenses and Maintenance benefits will be cancelled.
*Price shown in GBP, ex VAT. Pricing is available in Euro or USD, just select your chosen currency at checkout.
An INSYDIUM Annual Subscription provides both X-Particles and Cycles 4D licenses on an annual basis at £312* per year. Once your initial one-year term has ended, the subscription will automatically continue on an annual basis unless you cancel before your next term starts.
Annual Benefits:
Please Note: In the event you cancel your subscription, reverse or fail to pay your subscription fee payment, the licenses and Maintenance benefits will be cancelled.
*Price shown in GBP, ex VAT. Pricing is available in Euro or USD, just select your chosen currency at checkout.
When first opening Cinema 4D after upgrading/installing X-Particles Build 742 on Windows, you may see the below error message:
If the Microsoft Visual Studio Redistributable files are already installed, just close Cinema 4D and then reopen it. This should clear the message.
If the error message continues, you may need to download the Redistributable files, see 'How can I fix runtime errors in the Cinema 4D Console?' for help.
X-Particles 3.5 - Cinema 4D R14-R19
X-Particles 4 (Build 535) - Cinema 4D R14-R20
X-Particles Build 642 - Cinema 4D R14-R20
X-Particles Build 728 - Cinema 4D R14-R20
X-Particles Build 732 - Cinema 4D R14-R21
X-Particles Build 742 - Cinema 4D R14-R21
Cycles 4D Build 321 - Cinema 4D R14-R20
Cycles 4D Build 336 - Cinema 4D R14-R20
Cycles 4D Build 353 - Cinema 4D R14-R21
Make sure that you have sent proof of your academic status to our Sales team.
To do this contact Sales and attach one of the following:
After submitting your proof of academic status, please allow up to 3 working days for your order to complete.
Please note: Proof of academic status must be in the same name as the license is to be registered to and if purchasing as a teacher, the license must be registered to your academic email address.
If you have done this, allowed 3 working days and are still waiting to be given access to your license/product, contact Sales for an update on the status of your order.
Removing your plugin is very straightforward.
X-Particles can be installed on as many systems as you want, but can only be open on one system at a time.
For more information on managing your license and offline periods, see the X-Particles Help Manual.
Every Cycles 4D is individually signed and registered to its owner on downloading from your Customer Account after you have purchased. This information is encoded into Cycles 4D. Your Customer Account stores your personal download and it should not be shared with anyone else.
If you have Cycles 4D installed already in Cinema 4D and have the Cycles 4D Updater enabled (with an internet connection), this will always give you the latest version of Cycles 4D available for your license.
Please see:
Cycles 4D Manual/OpenCL
Cycles GPU Rendering
Cycles OpenCL
Cycles CPU/GPU Features
Ultimately, you will need to try this yourself (Try Cycles 4D) as it depends on your system and drivers. There are too many combinations for us to test and list all.
No, Cycles 4D is only compatible with X-Particles 3.5 onwards.
Yes, there is a free 3-month* Trial for both X-Particles and Cycles 4D. To access the Trial, submit a registration request on our Try page and we will send you a license by email. You will need then to create an INSYDIUM account to access the Trial download.
In submitting a registration request, you agree to only use the Trial for trying the features and not to undertake commercial work, you also agree to allow us to contact you via your email address for marketing purposes.
* During the COVID-19 pandemic, INSYDIUM has reset all Trial licenses and extended the free Trial from 14 days to 3 months, until further notice.
Yes. If your X-Particles license begins with 'XPL' please enter the coupon code 'XP30' and your X-Particles License at the checkout to receive a 30% discount. Your Cycles 4D License needs to be purchased with the same email that your X-Particles License is registered to.
Yes, but not instantly, the updates will be delayed as our Development Team will be working on the implementation into Cycles 4D.
Our Development team have been working on the seamless integration of Cycles 4D with Cinema 4D. Concentrating on X-Particles support for obvious reasons, in addition, we do support TurbulenceFD. The future of Cycles 4D includes continued development, which does mean offering support to other 3rd Party Plugins.
The Blender Foundation is an independent non-profit public benefit corporation that exists through funding or revenue mechanisms that serve the foundation’s goals and cover their expenses. INSYDIUM LTD is a company whose Development Team have worked tirelessly for over a year on creating the bridge to Cinema 4D. We have incurred a significant financial cost; however, we have tried to keep the price as competitive as possible. The long-term goal is to support the Blender Foundation, we are currently a Diamond Sponsor and are in discussions as to how we can help them in the future.
A node/seat is considered to be per Cinema 4D/Team Render/CLR Client.
Yes, Cycles 4D Supports CUDA 8 (needed for the Pascal architecture).
Cycles 4D licenses need an internet connection at least once every two days by default (can be extended to 14 days for perpetual licenses).
If you are still having problems and have an internet connection but Cycles 4D won’t use it, please contact our Customer Services team. Please be aware that we can only offer suggestions and limited help finding the cause as every network and security setup is different.