I bought the game recently and played it fine. Even closed and opened it a few times. The next day roles around and now the executable is missing. I try to uninstall and reinstall and the exe and it is still missing. I even re-download the offline files and they are still missing. What do I do now?

It's fixed now. I renamed the file before installing, and now the exe is there. No idea why that worked, but fine I guess.