Quote - Just looked up Interposer Pro and it says-
" Texture image files with Poser 4/ProPack-level material support."
Meaning no skin shaders?
I couldnn't live without my skin shaders (or many procedural-node textures)

its really impossible to convert shader systems from one program to another, they generally work completely differently. If you want to use poser shaders than stick with poser. C4D has much better shaders than poser though, it does mean a little more work but frankly the rewards will far outweigh the work.