Be careful of adding previous versions of Poser Runtime Libraries. I originally added my P2014 Pro library. When I fired up P11 I got python script errors (even though I had no scripts installed in P11 yet). Here's how I solved that problem.

If you add the Runtime directly and have python scripts you might get errors every time you start P11. I solved this by moving the few items I'd installed in P10 2014 Pro to another external runtime (make sure to keep the python script libraries in their original program install then adding the external library). Let me say that in a better explanation. I had an older runtime of P7 that was laying around without any python scripts (and any content really). I moved the content I wanted to use in P11 from my copy of P10 2014 Pro to the P7 runtime. I think added that runtime to both versions of Poser and had no python script errors.

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.