I don't have the steam version (mine's from GamersGate), but I do have the Phileasson's Secret expansion, and the AddonPack works fine with that. Ergo himself stated that the mod works with both the vanilla and the Phileasson's Secret version.

The only thing that comes to mind is to apply the mod twice. First on the vanilla version, and then again after installing the Phileasson's Secret. However, since I don't have the Steam version, I can't be really sure.
 
But why are you using that pic on avatar? That person IMO should be burried alive and deleted from history. Dunno why am I calling that a person at all.
 
I didn't know who that was either and had to look it up, but wow, yeah that is a terrible choice for an avatar pic.
 
You could try sending Ergo a personal message ...
Personally, I don't know.