Look, I havent played/modded/enjoyed halo in a LONG time, i cant email you guys telling you how to install. If the mod doesnt work for you, too bad i cant help you.
P.S. This MIGHT be your problem by the way: do NOT apply this to Halo:CE(custom edition) this mod was created before Halo:CE only apply the ppf's approately to Halo PC! Also, bitmaps.ppf goes to bitmaps.map and bloodgulch.ppf goes to bloodgulch.map