Allright, I thought it would work with only 1 DLC as well. What DLC's are required?

Last week, ive installed TruckSim via Steam. Have no DLC packages installed. Today, ive downloaded the latest 2.41 ProdMod and copied the files to MyDocuments\\Euro Truck Simulator 2\mod folder including the promods-def-v241.scs file. But all mods are "Red" in TruckSim. What am i missing?