Use the installer and use the same WaW-profile, and it should work
When i use both installers, one overwrites the other. That happen because both installers use the same folder. If i put the files in a different folder each mod has it level and experience. I already try to put all files together (not overwriting files with the same name) on the same folder and use the map command (map map_name) to load the other map. That command load the map but no zombies appears.