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Same issue here (Mac OS Big Sur), when I click on the application file, the icon bounces for a second, but it won't start the program. That's why I'm running the game on Parallels (a tool that allows you to use Windows on your Mac). That might be a solution for you, ika209.

The newest version of demo works, however I was thinking of getting an alternative way to run windows softwares so I may check up Parallels, thanks!