Steps to Download and Install GTA San Andreas for Android:
First, enable the unknown source of your mobile, for this go to mobile Setting>>Security and enable the unknown source of your mobile.
Now download GTA San Andreas APK and SD data from above links on your mobile.
Install GTA San Andreas APK file but after installing do not launch the game.
Extract the SD (.Zip) data using any archiver from play store. After extracting the file move this extracted data file to Obb folder which is situated inside the Android folder. If there is no Obb folder inside Android folder create a folder named Obb.
Now launch the Game, play and enjoy.
If you have any issue during installation let me tell in comments.