I wouldn't worry about an upgrade that didn't capitalize on the existing base of Poser owners of version 3 or 4. It just isn't done. There is practically no scenario that would make it cheaper to buy Poser5 at the non-upgrade price given that there are relatively cheap copies of Poser4 around. No, I don't know for sure. I also am not sure that some nut with a nuke won't blow up my city. The odds of the latter are higher than the former.

Gordon