Poser only uses its Runtime installation of Python, and that can't be updated.  Installing Python separately won't have any effect on Poser.  Which is kind of a bummer, really.  It would be nice if Poser were more like Blender in this respect, able to look outside the Runtime for a full installation, to use that when it's available.

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Cage can be an opinionated jerk who posts without thinking.  He apologizes for this.  He's honestly not trying to be a turkeyhead.

Cage had some freebies, compatible with Poser 11 and below.  His Python scripts were saved at archive.org, along with the rest of the Morphography site, where they were hosted.