Look man.. you shouldn't get defensive, this problem seems to be entirely on you. I downloaded a lof of games from this site and never had single problem... I know a bit about computers, networking and such, the game's .exe file are harmless, they don't connect to the internet, they don't mess with any PC files or config.... I can manipulate the game files as I see fit, same as the other 2 told you, Vegetta and Purple... How about this? If I have a problem or consider that I have a problem in specific, but others don't ever have it with the same software.. should I blame the software or my PC or just assume the other users don't know anything or are wrong for not having the problem...?
What it looks like it's you installed the game in a folder that either has limited permissions... that you are not full Admin on your PC account or when you installed the game... The way you unzip the files or your Windows config, something created a problem that made you blame the game... For starters... you said your AV placed the game in quarantine, you are using bloatware, 3rd party AV is garbage on your system... If you paid, even worse. Why do you feel the need to use that? Have you researched that normal Defender and monthly Malwarebytes scans are more than enough? There are also plenty of tools to manually check everything that happens in your computer.... Try Autorus for example, nothing escapes it, it's like a God-eye for your PC... You also should have checked what the game process was doing at that very moment, not just decide to delete everything on the spot.... Some processes can't be deleted or moved if such is active, this happens to any game.... Even a Steam game, try to something to it while open, you can't, Windows does this for safety...
It's known that this game may get flagged as virus by bad Antiviruses, somewhere it was explained it's related to the game's Unity emulation layer or some similar system, even legit game users (Patreons) saw similar situations.... You simply cannot nuke an entire Windows install due to something as small as hardware perms issue... Like this puts in doubt you know how to use a computer, checking folder perms would have sufficed.... I am pretty sure your AV, whichever it is, did this to you and you did not even consider that... That's what happens when you trust your whole O.S and files to some company that promises "muh security"....