some one has been running around asking the questions so its getting annoying

ok dumbass here we go..
go to:
C:\Program Files\Steam\SteamApps\buhhda240@netscape.net\condition zero\czero

extract the folder from the file you DL'd take out the Models and Sounds folders(sometimes theres no sound...dont lose a nut over this its just the way it is)

as simple as jacking off(not in your case) put the models folder from the file you downloaded into the other models folder that you have and the same thing with the sound
if you fail to do this kill yourself in your closet with your thong you play with at night and do not write a note on why you did cause no one will care accept for your mother cause you hungyourself with her dirty underwear