SR-3 is for Poser 5. Don't try to install it if you don't have P5. Bad things might happen. I got my P4, PPP, and P5 as boxed editions, so I can't help with the internet install process. I'd assume that you need to install the files as follows, but don't quote me on it: Poser_4_Installer_CD Poser_4_Setup Poser_4 Content Poser_4_Support_Files Pro_Pack_Core LW_plugin Good luck!