If your 600MB version is crashing or won't open, follow these steps:
What I can do is help you with and common fixes for issues if you already own the game:
Install the GTA San Andreas Silent Patch by Silent (available on MixMods or GTAForums).
: Errors such as "Requires at least DirectX version 9.0" are frequent since modern PCs often use newer, non-backward-compatible libraries by default. Essential Installation Fixes