You're looking for a link to download Grand Theft Auto: San Andreas (GTA SA) for Android, specifically version 5.1. Here's what I found:
Unfortunately, Rockstar Games doesn't provide a direct download link for GTA SA on their official website. However, they do offer the game on the Google Play Store. gta sa android 51 link
Enjoy playing GTA SA on your Android device! You're looking for a link to download Grand