@TheComet, sounds like you got it from github?
If so, it is the version they reverted back to when they started to make GameGuru(might have been fpsc reloaded originally?) - before changing their minds again and going c++ route, it is version U7.1, given the latest dated files are 01.11.2016 nothing has been done for win11 use, perhaps for windows 10 at the time, perhaps not. This
may have been their in-house version of U7.1 because I don't seem to remember any GG logo with the standard U7.1 package when installed over the standard DBP installer. I would have to double check that but I am fairly certain I had 7.1 before gg/fpsc reloaded was announced and the exe icon was standard DBP logo.
Win 10 Home 64, Intel(R) Core(TM) i5-10300H, 8GB DDR4, NVidia GeForce GTX 1650 4GB GDDR6