It did not. But I uninstalled Pyzo and was then able to successfully install and run the original 64-bit 4.6.0 Apparently that's all it needed. Thanks! I would close this issue, but I'm not sure if ...

I don't really understand the connection between my Python installation and the yoton package included in the pyzo installation, and I think my solution is a hack, so unless told otherwise, I'm not ...