Uptodown is a legitimate software distribution platform founded in 2002. It is not a torrent site or a "warez" forum. It aggregates freeware, shareware, and trial versions of applications. For paid games like GTA San Andreas , Uptodown typically provides a launcher or a trial/demo version, or links to official distributions.
If you want, I can:
Search for if you are a modder , a long-time fan who hates the remaster, or someone trying to run the game on an old offline PC. If you just want to click "Play" and relax, buy the Definitive Edition (though it has its own problems) or wait for a Steam sale. uptodown gta san andreas pc