You may find that the game crashes during specific missions because the necessary audio or video files were stripped out to save space. How to Actually Run GTA IV on Low-End Hardware
Lowering the graphical fidelity to almost unplayable levels. The Risks of "Ultra Compressed" Downloads gta-iv-900-mb
A 900 MB file represents less than 5% of the original game data. To achieve this, a "ripped" version would have to remove: You may find that the game crashes during
Searching for these ultra-small versions often leads to questionable websites. Here are the common issues users face: To achieve this, a "ripped" version would have
Many "highly compressed" links are clickbait designed to install harmful software on your PC.
If you are looking for a 900 MB version because you have a "potato PC" or limited data, there are better ways to enjoy the game:
The Myth of the 900 MB GTA IV Download: What You Need to Know