You can keep your game files on an external SSD or a high-speed USB drive and play on different PCs without re-installing. Why Use a Portable Version of GTA 5?
While the 3DM Launcher provides convenience, users should exercise caution.
Ensure all game files (the x64 archives, common.rpf , etc.) are located in a single folder. Unlike the standard version, the portable version relies on everything being in one "root" directory. 2. Add the Launcher Files