The popup windows is simply indicating that one of the Python addons can't load, whatever the Poser version given what you are explaining. I suppose that like most of us, you share part of your runtimes collections through both Poser.

If you don't use Reality anymore, then just loop through your runtimes and delete the "reality" folder that is located under "runtime : Python : addons", such as in this example:

𝒫𝒽𝓎𝓁

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