Always run Lumion as an . Right-click the shortcut and select "Run as administrator" to bypass most permission-based license errors. If you want more technical details: The exact error code appearing on your screen Whether you are using a Trial or Pro version Your Windows version (10 or 11)

Before clicking buttons, it helps to know what Lumion is checking. The license validation system looks for three things:

If you are on a Student License, these errors often occur because your trial period expired or your educational institution disconnected you from their network license.