Searching for a "10MB highly compressed" version of Grand Theft Auto: San Andreas
Modders often release "repacks" that remove redundant audio, reduce audio quality, or use advanced algorithms to compress the file size.
The 10MB file is not the game itself. It is a setup wizard or a custom torrent client. Once opened, it begins downloading the actual gigabytes of game data from an external server. 2. Malicious Software (Malware)
You might download a file, only to find it requires you to complete surveys, install other software, or pay money, never actually delivering the game.