If that fails, try the method:
If you have an old .rar file named GTAVC.part1.rar through GTAVC.part45.rar , there is a 60% chance www.softworld.com is your key.
(Frequently used for compressed versions and the Definitive Edition)
: Revisit the website; the password is often highlighted in red or listed in the technical specifications.
Some cracked versions password-protect the save game folder. This is not a real password—it is a bug. You must run the game as Administrator once to create a clean save folder.