I am assuming that you are familiar with MATPose files.  If so, going into the Pose section of the Poser Library will reveal the skin textures for V4.  Otherwise, those textures would be found under Materials. Again, this is assuming that you installed the content correctly.

Injection Morphs will only work if you have installed the V4 Morph++ package or any other package specific to the suggested morphs.  Without the pack, you will get errors.