VU-MOD PASSAGER PROBLEM

I have a problem, I have install on my server some pack with cars what was made by TheDanishMaster for exemple " http://www.garrysmod.org/downloads/?a=view&id=126279 "
But the problem is that 2 player cannot go in the car. Maybe I install wrong VU-MOD but I know that is possible 2 player go in the same car because I was on Fragnet.net - Official TDMCars Server and there is possible.
I copy VehicleUpgrade in addons , this is the right place ??