A "no disk" patch seems to be the only way users have reported that this title is playable on Windows 10 and 11.
Topic on Talk:Gears of War
The disclaimer about SafeDisc implies as to why. https://www.pcgamingwiki.com/wiki/Digital_rights_management_(DRM)#SafeDisc
Hi,
There was also a related bug that caused the SafeDisc warning on the top of the page to not appear in some circumstances which could cause the warning to go unnoticed.
I have fixed that bug so the warning now appears at the top for this game and others like it (where no digital releases are actually available).
Cheers!