Could you help me, please? I have a problem with opening a game

GiB2

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Hello! Could you help me, please? I'm a Mac user and I downloaded a game on "Parallels Desktop". First, when I tried to open a game there was a error: "Sorry this application cannot be run under a virtual machine" (I clicked on "Let's start a game" in pop-up window). And when I restarted a "Windows" the game completely stopped running (There's not even a pop-up window). My version of "Parallels Desktop" - 16.5.0 and my iMac: 21,5-inch, Late 2013 (was installed the latest update). What should I do?
 
I'v fixes it by enabling nested virtualization in settings.
But I have another problem. When I'm gaming there is a multicolored texture glitches and I don't know how to fix this. I saw a solution to a similar problem with other games, here it is: "You should paste the following text in the "Boot flags" field in the settings: "video.untrimmed_dynamic_cbuffers=1". I tried and it didn't help. I set right settings (Enable nested virtualization and auto settings in "CPU and Memory", optimized the application for games) in "Parallels Desktop" and it didn't help. I tried to change game setting but even this didn't help. I would be very grateful if you help me with this problem.
My computer: iMac (21.5 - inch, Late 2013) Processor: 2,9 GHz quad-core processor Intel Core i5; Graphics: NVIDIA GeForce GT 750M 1 GB
(I have the latest update)
"Parallels Desktop" version: 16.5.0

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Hello there! Did you solve your issue, buddy? I really hope you did because I'm currently going through the same issue, and I'd highly appreciate your help.
 
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