Installing .NET 3.5 & 4.8 on Windows

Modified on Tue, 25 Jun, 2024 at 10:09 AM

EDIT 2021-10-20: Latest C-Pen Core requires .NET 4.7.2
NOTE: .NET 4.8 is backwards compatible with 4.7.2

Just installed C-PEN Core and it does not start properly?

Is there a “.NET missing” error message?


.NET is a Windows component used by C-PEN Core software, the Windows software to use with e.g. our TS1 models. In Windows 10, .NET 3.5 does not always come preinstalled which will cause this error. To resolve it – .NET 3,5 needs to be installed manually.


The video below shows the step.




  1. Open Control Panel
  2. Go To Programs
  3. Select Turn Windows Components On Or Off
  4. Locate .NET 3.5 and make sure the check box is checked.
  5. NEW: Locate .NET Framework 4.8 and make sure the box is checked.
  6. Click Apply/OK to install.


Now get back and try to restart C-PEN Core.

Was this article helpful?

That’s Great!

Thank you for your feedback

Sorry! We couldn't be helpful

Thank you for your feedback

Let us know how can we improve this article!

Select at least one of the reasons
CAPTCHA verification is required.

Feedback sent

We appreciate your effort and will try to fix the article