I also have the same problem, I found a video about this mod recently and it looked like it could be fun. But as I joined servers, dozens of servers there was no zombies and free roads. I noticed on the Debug window that it said zombies: 0. I did the same thing re-installing the mod with no prevail in fixing it. I hope this gets fixed soon, since otherwise playing DayZ is not so fun without having the zombie aspects. Since all I need to do is head to any town to find food, and wont have to worry about dying from zombies, just possibly other players, that is if I can actually see them as well.