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Yeah, I use Avast. 

Actually, I've already tried deactivating it while installation was going but it always reached the same result with or without so I don't know if it's that.

It's definitely that. Avast likes to flag random files as harmful and messes with them in a bunch of ways. I've done experiments with it before in a VM and it was one of the worst offenders :(

So, any ways to fix it?
As I said I've tried desactivating Avast and the result is no different.
Should I get other antivirus that doesn't mess with itch or something like that?