The game is still fairly new, so anything that could just change a single file of your game, even if it doesn't give you any advantage into the game, could get you VAC banned. So just don't download or change anything related to the game, it's risky and useless.
Most people that are getting VAC banned says they didn't hack because they automaticly regret it and then will do everything possible to get it lifted. However, if you have installed a hack, you can't get it lifted and Valve WILL NOT tell you what hack and at what time you got flagged (because VAC ban doesn't show on your account automaticly after hacking, it might take a week, if not two, so you do not know what hack got you banned.)
So good luck with getting unbanned, but have almost a 100% chance that you won't.
Best solution here is create a new account and buy the game again. (Make sure to clean your computer first).

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