Hi David, You've got a couple of things going on. 1) Power PC or Universal Binary Carrara, and 2) Power PC or Univeral Binary Plug-ins. Your "old" Power PC C5 will run on your Mac Pro under Rosetta. If you're using the Power PC version of Carrara on your Mac Pro, then the Power PC plug-ins you have will be just fine. If you've downloaded the free update Univeral Binary version of Carrara, (Carrara will run on either Power PC or MacTel natively) you will need the UB version of the Plug-ins for the UB version of Carrara. All of DCG's plug-ins have UB versions but the Power PC plugs will not work on the UB version. Inagoni has converted some but not all of theirs. Shoestring Shaders is in the process of converting theirs. I'm not sure about some of the others out there. The plug in developers are providing the updates to UB at no charge. So, it depends on what your set up is. Mark