A standard installation of Grand Theft Auto: San Andreas requires approximately of hard drive space.
Most 50 MB links for the full PC game are either fake , contain only mobile mods , or are malicious installers . A true 50 MB file for PC is usually just a downloader or a heavily "ripped" version missing all audio, cutscenes, and radio stations. System Requirements for PC
Because the game is over two decades old, it can run on almost any modern "toaster" or low-end laptop. Grand Theft Auto: San Andreas system requirements