Warhammer Forge in Armybuilder
 

I've got a bit of a problem as to I can't seem to add any Warhammer Forge models to my army lists in Army Builder.
I've chosen the options to be able to add forge world and warhammer forge models. But I can't seem to find them anywhere, nor find any solution to the problem either.

Do I need to download any additional data files or have I just messed up somehow?

Any help would be very appreciated!

As there are only a few lists with WF model rules you would have to use one of them; are you trying to make an O&G, Chaos, or Empire list?
All the other big gribblies are designed for Storm of Magic Ames so you'd have to have that option set too.