Solving a "Lumion Invalid License" error often stems from communication breakdowns between your software and the licensing server. This issue can occur due to security software blocking connections, incorrect registration in your account, or outdated system configurations. 1. Verify and Register Your License Key
Try these solutions in order. Start with the quickest fixes first.
and restart the program. This file can be sent to Lumion support for a technical audit of the activation failure. Check Hardware/Disk Space