The good news is that you don't have to compromise your security or play a stripped-down version of the game. Rockstar Games provides safe and official ways to play GTA: San Andreas:
Searching for a "highly compressed 700MB" version of Grand Theft Auto: San Andreas
A highly compressed game is a modified version of the original game files. Special archiving software squeezes the data into a much smaller file size. Gta San Andreas Highly Compressed 700mb Pc
If a website instructs you to disable your antivirus to install the game, close the site immediately.
Downloading highly compressed games from untrusted websites puts your computer at risk. Malicious users often hide malware, trojans, and crypto-miners inside these small archives. The good news is that you don't have
Should I look up specific or installation guides for the different versions available online?
"Free Ride Mode"
Low System Requirements: Runs smoothly on older PCs and laptops. How Compression Works