I bought the game but when I try to install it, it says no compatible downloads were found...
Just tested the download on my system, it works so file integrity is not the problem. Can you provide what OS you are using? It sounds like a Windows 10/11 UAC control issue. If you see a splash screen that says "Do you want to allow this app to make changes to your device?" just accept the "risk" and you should be fine. Windows treats Itch games in this manner because MS wants to see a digital certificate for every install, but that is prohibitive to most independent developers.