Solutions
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ac455's post in GTAV Won't launch after update, Error code 7002.1 was marked as the answerAwesome!
I was about to write I also found the fix.
Slightly different to yours, I moved the GTAVLauncher, PlayGTAV, and GTAVLanguageSelect from the vanilla version and put them in the old 2944 version. I left the old GTA5.exe there and everything is working as normal again.