whatever you do don't move the poser4 runtime or any files in it to the poser5 runtime, Poser5 doesn't like it & may even be broken by doing that. Open the library palette in Poser5 & click on the up arrow till you get to a section with just 2 entries (Poser5 & downloads) hit the + at the bottom, then use the search box that comes up to find the poser4 runtime, select it & hit the ok button & everything will be ready & waiting for you to start using :)