You can purchase and download directly from the source through the official Rockstar website.
By following this guide, you'll be able to download and install Grand Theft Auto: San Andreas - Definitive Edition on your PC and experience the game in all its glory. --- Gta San Andreas Definitive Edition Download Pc Highly
Official versions auto-update, feature Rockstar Cloud saves, and allow for modding (though Grove Street Games locked down some files, basic mods still work). You can purchase and download directly from the