I have installed it (several times) but it still refused to either
b) show in the list of installed plugins
in case a, I click on hide tempratures and next time I start the printer the screen it is un-ticked
in case b, I can't see it under installed or available filters.
I have installed it using the url, and directly on the pi using .oprint/bin/python setup.py install.
Both show complete with no errors.