Can't load SW1200 MCSA

I just downloaded this route (Ver 3.1) and the fix, but when I try to run one of the free form scenerios, I get a message saying that the "SW1200 MCSA cannot be loaded". I found the SW1200 in the "..../Assets/BritKits/EMD/RailVehicles/Diesel/SW1200/MCSA", but it will not load! Any suggestions? I would appreciate any help! Thanks in advance.