Sometimes, these files are meant for Android. The 24MB file claims to be the "data installer," but it is usually just a fake APK that bombards you with ads every time you tap the screen. It never downloads the actual game.
Occasionally, a 24 MB file might be a low-quality mobile game (like an old Java or early Android game) that the uploader renamed to "GTA 5" to trick people into downloading it. While this may run, it is not GTA 5; it is likely a cheap knock-off with stolen assets. gta 5 iso file 24 mb
The most common payload in these files is malicious software. When you extract the ISO or run an accompanying .exe file, it may install: Sometimes, these files are meant for Android