I should check if they want information about modding the game legally. Modding itself can sometimes be in a gray area if it doesn't infringe on copyright. But distributing pirated versions is definitely not allowed. Maybe the user is creating a legitimate mod or a fan-made project under fair use, but that's a stretch. The 200MB size is also suspicious because GTA San Andreas retail versions are much larger. So it's likely a pirated copy being offered for download.