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Hey
first:
It Works, but i dont know if you can play online with this file

Which folder to copy and paste:
C:\Users\USERNAME\Documents\Rockstar Games\GTA V\Profiles\FOLDERNAME
Replace the names like CrypticBridge sayed.

Make a copy of all files in case it dont works.

Delete cloudsavedata.dat

Delete all files - leave only:
cfg.dat
pc_settings.bin

Copy and Paste the downloaded file
Rename them to:
SGTA50015
SGTA50015.bak

Start the game

If you have your own save games that you want to keep
just name them like:
SGTA50000
SGTA50000.bak
SGTA50001
SGTA50001.bak
and so on - leave them in the same folder