A "portable" 100% save means you can take a single save file ( GTASAsf1.b through GTASAsf8.b ) and use it on without breaking the save.
For "portable" versions where you want the game and saves to live on the same USB drive or folder without relying on the Windows "Documents" folder, follow these steps: gta underground 100 save game portable
When you download a save file, it will typically be a single .b file. It’s crucial to this file to match an empty save slot in your game. For instance, if you have a save in Slot 1, the file might be GTASAsf1.b . If you want to use the downloaded save in Slot 2, rename the downloaded file to GTASAsf2.b . A "portable" 100% save means you can take