Yeah when I had the same problem I contacted DAZ and they stated that Poser 5 is not supported. The M4 base package, will eventually install as V4 does, so will his morphs package, (eventually) also. But so you know when I got them and installed them using Poser 5 I found that when I would  to load them to M4 nothing, nada, zipo. The dials don't work.

"The Blood is the life!"