Just point the installer to your Poser directory and it will do the rest.  On my system, Poser is located at "D:Program FilesCurious LabsPoser (5 & 6)" but your installation will be different.  I don't have P4 or the ProPack installed any longer since I got P7 and I don't support anythin below P5 for my products any longer.

Hugz from Phoenix, USA

Victoria

Remember, sometimes the dragon wins. Correction: MOST times.