

Yes, you install it on the desktop with protonup
Yes, you install it on the desktop with protonup
Might have to right click and make sure it’s executable, then double click it to install.
Try spamming the space bar on startup and choosing an older kernel
Pop Os uses SystemD and not GRUB
According to this support article, they are still allowing downloads
https://support.apple.com/en-au/guide/tvapp-windows/atvbe9ddc3f/1.4/windows/10
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God of War
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Sounds like Linux Mint would be a good start for you