Check the status of your subscription or perpetual license. If it says "In Use" but Lumion isn't open, you may need to wait a few minutes for the session to timeout or contact support to release the seat.
A common "hidden" cause is a modified hosts file that prevents Lumion from reaching its home server. Open as an Administrator. Navigate to C:\Windows\System32\drivers\etc\hosts . Look for any lines containing the word "lumion" . lumion invalid license fix
Ensure you're running the latest version of Lumion and update your license file: Check the status of your subscription or perpetual license
Delete those lines and save the file (ensure it does not save as hosts.txt ). 4. Release "Stuck" License Seats Open as an Administrator
Lumion stores your license info locally. Deleting this forces the software to re-download a fresh token.
I can provide a more tailored fix once I know these details!