Having Poser 4, 5, 6, 7, 8 pro, Pro 2012, Pro 2014 and 11 all working just great and Stable on win 7 and win 10 . all are still in use due the need of different Pythons and addon. Poser 4 render engine can also be useful for certain render results. Poser 4 - 6 are running Portable 7-11 are installed in sequence latest 11 directly in the C root in a Poser Folder. Not in the C program folder as this is causing big issues, original runtimes are set to be in the Poser program folder and not in the Own data Root, this method also ensures that the Installs can be kept Portable without any further issues and conflicts with further Libraries and Python collections that are individually made for the Poser versions. If you still want to use Flash library you need an older flash version and IE with Flash that should make the trick else using the Air Floating version less complicated solution.