Zeno Clash maps in Garry's Mod

Has anyone got the arena or pit maps to load in Garry’s Mod? A few of the other maps will load, but the arena and pit ones freeze up while they’re loading for me.

You can’t do that, as Zeno Clash maps are mostly made of models, and the game uses a different model format than the default Source 2007 one.

The models aren’t the problem, they just show up as errors.
Is any else experiencing freezing when they try and load pit or arena maps?