Not being able to pin apps is probably a Windows 11 bug as Microsoft does not expect users to use the Games Explorer so the compatibility has decreased, but there could be a patch, I'll look around. Also about the rating server I do not know how to fix that and also don't know if it can be fixed, I just bundled the patch as an auto-patching tool and the steps and files can be found on the WinClassic forums.
The dark mode bug is almost certainly another Windows 11 bug and likely cannot be fixed.