To run an old app or game on Windows 11, use your operating system's built-in compatibility mode. To use compatibility mode, right-click your app or game, click "Properties," open the "Compatibility" ...
At this point, your computer will exit Windows and enter the OS installer, which could take some time. It'll restart a few times during this process, which is normal. If all goes well -- and it should ...
If Windows Update says your computer doesn't meet the Windows 11 requirements, you might just need to tweak some settings.