I've heard may of you have problems with the GTA 4 hud.That it is not compatible or crashing. With this, Problem=Solved!  This file comes with the compatible version of the HUD.  Sorry there is no Readme file but

1. Download the files.
2. Extract them to your preferred destination.
3. Juz drag the files in to the GTA SA ROOT FOLDER.
4. Don't worry, nothing is going to change 

Enjoy your GTA 4 HUD.