AC Evo Crashing when starting game

I bought Assetto Corsa Evo today and tried to start the game, but it opened to windowed loading screen for a couple of sec, then onto full black screen and then windowed white screen with “not responding”.

Has anyone else had that problem and how did you fix it?

BTW
I play on a bootcamped IMac, so might be the reason
My iMac has an AMD Radeon Pro 5700 XT
16 gb vram
40gb ram
Intel I7