@adp001 there may be hope that SymPy can be incorporated into Poser. NumPy and SciPy updates certainly can. Check this thread: Using SciPy module in PoserPro2012 where I've posted instructions. The packages need to be installed in an OS level Python 2.7 and linked into Poser Python to be accessible.

I see indications that Python 2.7.17 may bundle with Poser (at least on Windows), so some of the prerequisites and the ability to use pip and other package managers directly from within Poser may become available again. Hopefully they will do the same with macOS Poser Python [Hopeful]

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