Looking at what's included with the package for Demonix, it specifically states that it comes with bonus textures for Michael 4 Hooded Cloak. You must own the Hooded Cloak first in order to use the Material Collection. And as RedPhantom posted, you must have the right figure selected in your scene, otherwise, Poser will attempt to match the material to identically named zones or create unrelated MATZones to the mesh.