I've tried installing parmatic 2 as mentioned in the readme, but it doesn't seem to be running.

Please define "doesn't seem to be running?"

If you're concerned that nothing is printing in the Python console, don't be. I turned off all the printing because it was very annoying.

The only way you can claim to know it is not running would be if you have moved shader dials, but confirmed that nothing is changing in the material room. Have you done that. Most people don't even know how to get the parameters up while in the material room.

Go into the mat room.
Select one of the skin zones so you can see the skin in the preview of the root node.
Use the Window menu to display the parameters window.
Change the "Skin 2 Blend" parameter from 0 to 1. If parmatic is running, the mat room will refresh and you'll see the black skin. If something is wrong, you won't.

One subtle thing about this is that Poser doesn't send a notification to Python that a parameter has changed UNTIL YOU MOVE THE MOUSE.

If you're not using the mouse, or at least moving it, move it.

If you're still convinced that parmatic is not running, open the parmaticUpdater.py file. Change the line that says verbose = 0 to verbose = 1. Then run the script and leave the Python window open. Then move a dial. If it says "Parmatic Callback" (or similar - it's not in front of me) then the callback is working and something else is wrong.

What version of Poser? What SR?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)