Hmm, as I remember rightly, Poser 5 did have a copy protection scheme on it, although I think it was removed from the later updates. I'm not sure if it was still attached to the recent giveaway/$20 deal or not.

If it is copy protected, then you will need to let it connect to the internet, I think. Perhaps it does have an install limit. I just don't know; it's a long time since P5 was out, you know?

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"you are terrifying
and strange and beautiful
something not everyone knows how to love." - Warsan Shire