Do not install to C:\Program Files (Windows protects this folder). Instead, install to C:\Games\GTA San Andreas to avoid permission errors.
Because the game is compressed from ~5 GB down to 50 MB, you need to know what is "missing" to manage your expectations: gta san andreas 50 mb download pc top
If the 50 MB version is too buggy for you, consider these better options for low-end PCs: Do not install to C:\Program Files (Windows protects
Grand Theft Auto: San Andreas – The Definitive Edition on Steam gta san andreas 50 mb download pc top