Hi Billy3d, You can use this in some ways with Poser 4, but a valid Poser 5 installation is needed. The new features in the plugin require us to use the Poser5 libraries which means you do have to have Poser 5 on disk, there are also more features coming which should make this even more exciting. Here is the workflow we are recommending for people who want to keep working with Poser 4. 1) Install Poser 5 2) Use Poser 5's multiple runtime feature to add your poser 4 runtime directory 3) keep working Poser 4 Now you can keep working in poser 4, and the plugin will be able to load your files. You might need to just open, and save the files again from poser 5 before import, but you should be able to keep using poser 4 in this way. cheers! -Josh