I wanted to mention one more thing. As always we do offer a full 30 day satisfaction guarantee on our products. So if Poser 5 is unable to support Poser 4 content and you are unable to get the support you need from CL about combatability of Poser 4 created products we are willing to give your money back on your purchase. But according to Curious Labs, Poser 4 products should work fine in Poser 5. Dan Farr