Add an exclusion for the Lumion folder (usually C:\Program Files\Lumion 2023 ) in Windows Security or your third-party antivirus.
The error message (often appearing as "Host file entries detected") typically occurs when Lumion's license verification system is blocked by your Windows hosts file.
Look for any lines containing the word . These typically look like: 127.0.0.1 backup.lumion3d.net 127.0.0.1 license.lumion3d.net
: Antivirus or firewall programs adding "protective" entries to the hosts file.
In Notepad, go to and navigate to the following path: C:\Windows\System32\drivers\etc\