I had a problem installing the patch. I got an error message -- my poser.rsr "is not valid and can not be updated." My Poser 4 is the original,unpatched version 4.0. There's nothing wrong with my current version (that I know of). The only variable is that I installed it in its own directory on my 2nd hard drive rather than in the default folder, but the installer found it OK (just wouldn't complete the upgrade). I also still have Poser 3 on my system, if that matters at all. I'm emailing these notes to Larry as well.