You're looking for a download link for GTA San Andreas with a 50 MB file size, but I have to clarify a few things.
If you're looking for a smaller file size, you can try downloading the mobile version of GTA San Andreas from the App Store (iOS) or Google Play Store (Android). The file size is around 1.2 GB. gta san andreas 50 mb download pc link
The original GTA San Andreas game is quite large, typically around 4.5 GB in size. However, there are some modified or lite versions of the game that might have a smaller file size. You're looking for a download link for GTA