Just run this patch and type the path to your san andreas folder. It can easily be found by searching gta sa downgrader or you can use this link. A downgrader will change your San Andreas version from 2.0 to 1.0.
However, removing the old files won't work, because that would change the file's size, thus still crashing the game. img file to get the files required for the map to show up in game. img file and put the map files in it, then use the gta.dat file in the game's install directory to have the map access this new. If you had modded it and it was bigger or smaller than the size programmed into the exe, then the game would automatically crash. Version 2.0 of GTA: San Andreas was released due to the Hot Coffee mod, it removed the script for the Hot Coffee scenes, as well as adding code to the game's exe (executable binary file that contains the game's program code) that checked the file size of the gta3.img file at start up.
