Do you open the zip files first before storing them in a library?  Dumb question, yes but have seen it happen.

Search for your programs library and install the unzipped runtime there.  It should merge with Daz runtime files.  If your afraid of corrupting the Daz library, then create your own runtime library, naming it what ever as long as it has the same structure as Poser or Daz.  After this is done then on interface of the program you will find a tab that says "search for Content?"  Click this and let it search.  It will find every runtime library on your computer.  If you don't know the structure of the library let someone know and we will give you the layout of the folders.