I don't know the answer. And I'm not going to tell you to upgrade. I'm the last person that should be saying that anyway given the face that I'm still using version 7 of Paint Shop Pro when Corel is already on version 12!  LOL

Anyway, I know about tight budgets so I thought I thought I would pass along this link.  Poser 6 is available for 75 USD, and that would entitle you to the upgrade price if in the future you wanted to upgrade to a version 7 or 7-Pro.

http://www.thebest3d.com/poser/

Now on the other hand if you are sticking with Poser 4 because you really like that version and it does everything you need the program to do for you, which is my reason for not upgrading PSP, then disregard this public service announcement, hehe

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi