: After installation, open the launcher and log in with your Rockstar Games Social Club account. If you don't have one, you can create a new account directly through the launcher. Alternative Official Launchers
You don't need a new EXE; you need to reinstall the launcher (not the whole game). gta 5 launcher exe download
Check the official Rockstar Games Support page or the Steam Community forums—but remember, never download files from random users. : After installation, open the launcher and log