On Thu, Sep 3, 2020 at 10:11 AM Ravel, Bruce <bravel@bnl.gov> wrote:

Aha! Attached log file. Sorry. Didn't notice that on my phone :(

I concur with Matt about Larch.

And at the risk of irking Matt, you could try forcing the use of
Ifeffit. While maybe not the best choice, it would isolate problems
with Demeter from problems with Larch and your python installation.

You can use ifeffit. It is just not supported and has known limitations and problems that will not ever be fixed.