The most common upload you will find (look for user "SquadAL" or the "OldGames" collection) contains a specific build of the game.
A lanky programmer named Maria led them to a cluster of machines with a half-working Pentium. "You ever seen the original San Andreas PC build?" she asked. Smoke grinned. "The one with cut missions and different radio?" She nodded. "We pulled some files from an old mirror backup. Might be salvageable." gta san andreas pc archive.org
Rockstar Games views San Andreas as a product to be updated, patched, and remastered for modern revenue streams. The Archive community views it as a static historical event that must be preserved at all costs. The most common upload you will find (look