Hey there! Sorry to make this random reply 2 months later, but someone posted something in the IMPOSTOR comments that made me wonder if it might possibly make a difference in getting this to open for you since both SR and that were made with the same engine :3
The person said that they couldn't get IMPOSTOR to open and that they're on Windows 11. They said that they went into properties and did the compatibility troubleshooter, which solved the problem and it opened fine for them after that!
It might not work for your situation with this one, but I figured I'd give you a shout just in case :3