Open the file named hosts (not hosts.ics ). Look for any lines containing the word "lumion" and delete them entirely.
To understand the error, you must first understand the Windows "Hosts" file. Lumion 2023 Host File Entries Detected
This notification halts your workflow immediately. You are left staring at a dialog box with no obvious "continue" button, forcing you to close the application. For many users, this error appears suddenly, even if Lumion was working perfectly the day before. Open the file named hosts (not hosts