Are you saying it works in Sierra but not Yosemite?
If so what exact error messages are you getting?
Did you see the python icon in panel (rocket ship blasting off)?
If not, please download the testplugin (see its thread here) and install and run it on both Yosemite and on Sierra via Parallels and let us know what it says about each plugin environment.
https://www.mobileread.com/forums/sh...d.php?t=267539