notepad C:\Windows\System32\drivers\etc\hosts
Older perpetual licenses (Lumion 12 and earlier) that are not linked to a Lumion Account may lose connection to updated authentication servers. You must create a Lumion Account configure Lumion to ignore it:
If you haven't done so, create an account on the official Lumion website and register your License Key. configure Lumion to ignore it:
Several factors can contribute to this error. Here are some of the most common causes: configure Lumion to ignore it:
Malicious software or previous troubleshooting attempts can sometimes add entries to your Windows hosts file that specifically block Lumion's connection to its servers.
Remove any lines containing license.lumion.com or backend.lumion.com .
If using a system proxy, configure Lumion to ignore it:
