I'd think that if you bought Pro, then you'll want the next version of Pro, not Poser 8. Poser 8 is not strictly an upgrade from Poser Pro, since you'll gain some features and lose others. If there was an important reason you got Poser Pro instead of or in addition to Poser 7, then you'll find the same reason to recognize the distinction.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)