itch.io

Tbh Renpy games work flawlessly in wine/proton, so you can just launch em through that or a wine manager/game launcher like Lutris, Heroic etc without any issues.
Just don't forget to move your saves to the new game folder and (optionally) to wineprefixes' /AppData/Roaming/RenPy/ too!

As one can see from the error message, what one actually should do is as following:

chmod  +x path_CrimsonHigh/lib/py2-linux-x86_64/CrimsonHigh

The meaning is "give file path_CrimsonHigh/lib/py2-linux-x86_64/CrimsonHigh permission to be an executable one"

Moreover, if for any bloody reason one has to use sudo and therefore root password for this, that means that something is bloody wrong with the system configuration itself.