"Witcher 3 Won’t Launch – antivirus detects GFSDK_SSAO.win64.dll as a virus" is not an uncommon problem judging from the search results I got. Here's a possible fix that might work for you. Good luck!
WARNING: This video guide only addresses the GFSDK_SSAO.win64.dll file being tagged as malware-infected by antivirus solutions, no more, no less. If your Witcher 3 won't launch because of other reasons, this how-to is NOT for you.
Timestamps:
0:00 intro
0:12 Disclaimer
1:06 The fix
1:21 The fix explained
1:42 Explanation why I'm not doing the fix yet
2:07 Why it's a false positive
4:19 What to do if you don't have Avast Antivirus
5:00 Outro
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