From what I've read I think it should be fine if you've got two licenses already. If not, there is the render farm option where you have poser on one and share the rendering function among the two using the Que Manager. I forgot the specifics but I know it's covered in a thread over at Smith Micro.... somewhere... Having different versions of poser even on the same machine is fine as long as you don't share some python scripts (that don't work in P11 but work in earlier versions). Also there are some P11 features that won't work at all on other versions. So say you saved a P11 superfly scene and tried to open it with 2014 it might import but wouldn't render in anything but firefly. Also P11 has lights geared to do superfly rendering. There's another patch update coming sometime this month with some fixes and character updates.

The dust settled, thinking "what a fine home, at least for now" not realizing that doom would soon be coming in the form of a vacuum cleaner.