Attached Link: http://www.keindesign.de/stefan/poser/firefaq.html

Most stuff should work just fine including the Vise installers, as long as you have OS 9 installed also. The installers run fine in Classic. Myself I almost always install to the desktop and then move the files to where I want them. Some people, including me, had trouble with the Mihai hair that won't render in Firefly, but there is a workaround for it. An excellent tutorial for Firefly is at the link.