(Back-up all files! Also, you'll need the IMGTool program to install new textures)
To install, take the file "ped.ifp" in the zip and substitute it with the current one in your game
Program Files/Rockstar Games/GTA San Andreas/anim/ped.ifp
Start the IMGTool program, and open gta3.img
Program Files/Rockstar Games/GTA San Andreas/models/gta3.img
Replace the following .txd files:
Rebuild the archive, enter the game, and you have zombies!
I tried it, and it works great. Peds walk bowlegged with their arms out in front of them, and strangely, their toes are curled inward too! There is at least one bloody ped skin (the construction worker). This would work great with some really good zombie skins.
nice. great alternative for people who don't want full conversions. also, just throwing it out there, this mod works great in conjunction with the zombie ped skins from Biohazard Alert. all you have to do is tell the installer to extract to an empty folder and out comes all the 'guts' of the mod. Now, you don't have to totally convert your entire game, it's easily revertable between the normal game if you just backup gta3.img and the ped anim file and you still get the thrill of a zombie survival. Just be sure you have some way to keep peds from spawning in cars if you are after accurate zombie intelligence and turn on the 'peds attack you' cheat and your done.
PS: a good cheat for keeping cars off the road, but peds on the street is the 'gangs control the streets' code