Unofficial downloads often contain incomplete or corrupt data that will prevent the game from running, even if they aren't malicious. Rockstar Games Launcher

This is the developer's official platform. You can download the Rockstar Games Launcher directly from their site. Once installed, you can purchase and download the game (approx. 111 GB) through the app.

Files found on third-party sites labeled "gta v setup tool.exe" or "GTA 5 setup.exe" are frequently malicious.

A widely used gaming marketplace. You can install Steam and search for "GTA V" in the store to purchase and download it safely.