I absolutely bought P5 pre-order and suffered through the Beta Program.
So did I. I thought I might not have been offered the pre-order discount because I changed my email address a while back and lost my old one. I emailed CL asking for the pre-order discount, but received an offer to upgrade for the non-pre-order discount price, which I did.

I just got this email:

Thank you for contacting Curious Labs regarding the Poser 5 Early Adopters Promotion. We apologize for the delay in responding, as we have had to verify all addresses against our previous lists. We have determined you are eligible for this special price to preorder Poser 6...

If you have any difficulties in placing your order, or have already placed an order and want to receive this discount, please contact Digital River directly at:

(Americas Store) 952-646-5000 -or- 800-656-5426
(Global Store) 0044 (0) 870 44 32188