Technically, the full, uncompressed PC version of GTA San Andreas (v1.0 or v2.0) occupies approximately of disk space. Reducing a game from 4.7 GB to just 200 MB requires extreme compression techniques.
Even the original 2004 version requires about 5GB of free space. Ensure your PC meets these basic needs before downloading. Technically, the full, uncompressed PC version of GTA