Do you mean you can't get the CEP to work in the single player mode? It won't, if that's what you were hoping for. There's a way to convert CEP into over-rides, but I don't know the procedure.
The CEP files need to be imported to use in the toolset, I think the option is under module properties, I'll double-check at home.
As for the heads, there's a heads over-ride you need to download, it should be linked off the forum downloads section.