Its an alpha so if you have some problems contact me :)
To install the mod you just need to put the file "Next_Generation_Warfare" in "C:\Program Files (x86)\EA GAMES\Battlefield 2\mods"
For the graphic overhaul put the content of the "for low config" or "for high config" in "C:\Program Files (x86)\EA GAMES\Battlefield 2"
BE CAREFUL TO INSTALL THE ADAPTED OVERHAUL FOR YOUR CONFIGURATION
Thanks for download :)