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Every antivirus I've used so far has flagged every patcher as a virus. They're known to change how systems work. I'd say its just a false positive as long as you've downloaded it from a good site.
I've used UXpatcher without any issues in the past. You just have to disable your antivirus while its installing, after that you can reenable.
As for download site, I'd suggest exploring for yourself for a bit. I prefer searching in deviantart. As for your Mac theme (I don't like Mac) here it is. Just make sure you read at least some of the comments so you can make an educated guess on whether or not they're safe (they're safe every time I've installed one TBH).
