I've got several products from Metacreations/FractalDesigns which were all supposed to be mutually compatable: Bryce, Poser, RDD, and Carrara. They weren't quite there, although they were closing the gaps with the plugins. But then everything got sold off and scattered to the four winds. I only hope the new owner!S! keep working together to ensure the compatability. Just on the safe side, I've been backing up all my patches and plugins downloaded over the months, and keeping all my old versions. However, I've only got P4.03.126, RDD5.02 and Bryce4.1. Everything else out there that's supposedly higher upgrades are apparently lost with the sell off. I can't find them.