Installation method: extract file and open the folder. Inside this folder you will find a file called GTASAsf1.b Copy that file and then go to data > gtasa.com.rockstargames open that folder up. Then go to > files then paste this file in there. And voila you can open up gta sa and load the save. Rerember this savegame is Ths beginning of the game i have not completed any missions. (YOU MUST HAVE ZARCHIVER TO INSTALL THIS)
Have a good time. I spent 2 hours completing the ambulance and vigilante missions.