The renders are stored on the computer (exported and stored, for the most part as pngs, as I render), and there are hundreds, all intact, backed up (along with other stuff) on an external hard drive and carbonite, so I think they are fine. By the "art I have generated" I am referring to the "parent" Poser documents, without which I can no longer improve that art, at least 3-dimensionally speaking. The message is "Poser content library cannot be displayed because it requires the Adobe Flash player. Please click below to install. Get Flash." I push the "Get Flash" link and says select an operating system and the only Mac systems available are 10.10 to 10.14. Going directly to the Flash site gives the same range. I am running 10.7.5, which has not been a problem (vis-a-vis Poser) for the last several years. Based on "Software Update" I believe this is the newest system software my computer can use. What upgrade are you referencing? I have not knowingly upgraded anything in a very long time on this computer, including Poser, Flash or the system software. I have not needed to do so.