For GTA IV, you could install mods and use them in singleplayer, and most likely multiplayer too. In GTA 5, feel free to install whichever mods you like, but don't use them online. It's very simple to get banned as GTA 5 is very well monitored.
For GTA IV, you could install mods and use them in singleplayer, and most likely multiplayer too. In GTA 5, feel free to install whichever mods you like, but don't use them online. It's very simple to get banned as GTA 5 is very well monitored.