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Instead of C:\Program Files , install Lumion to D:\Lumion or C:\Lumion . This avoids Windows UAC (User Account Control) conflicts that can interrupt "free" memory routines. Need official support
If you are a 3D architectural visualization artist, few things are as frustrating as clicking the Lumion icon, watching the splash screen appear, and then... nothing. Or worse, an obscure error log. watching the splash screen appear