GTA San Andreas is a single-player video game; even the latest version of GTA San Andreas, which is their definitive edition, is also a single-player video game. If you want to play GTA San Andreas online, then simply stop your ambition, because the latest GTA San Andreas definitive edition doesn’t have a multiplayer option, so don’t waste your time. External online mods for GTA San Andreas are also not working with the GTA San Andreas definitive edition.
If you want to play online with friends, then you can download GTA V online. You will really like the online mode.
If you want to download GTA 5 online, then you need to buy GTA 5. If you don’t know how to do so, then simply watch YouTube videos – Click here