Click on on the left panel. Click Change settings (requires administrator privileges). Scroll down to find Lumion on the list.

Check for conflicts with software like Citrix Workspace or certain VPNs. Temporarily disabling these while launching Lumion can help identify if they are the cause.

Lumion ties your license to your hardware ID. If you have recently:

Lumion Support can manually release stuck licenses, investigate server-side issues, and provide version-specific guidance that may not be covered in generic documentation.

Completely close your VPN software before launching Lumion.

: These often interfere with the connection to Lumion’s license server. Turn them off and try launching the software again.

Lumion is a popular 3D rendering software used by architects, designers, and artists to create stunning visualizations and animations. However, like any complex software, it can be prone to errors and issues, including invalid license errors. If you're experiencing an "invalid license" error with Lumion, don't worry – this article will guide you through the possible causes, solutions, and fixes to get your software up and running smoothly.

Change the file type dropdown in the bottom right from Text Documents (*.txt) to . Select and open the hosts file.

This is the solution for 70% of users. Lumion stores a license file locally. If that file gets corrupted by a Windows update or a crash, Lumion sees "Invalid."