The plugin says that my key is not registered. There is nowhere to register a key (yes, I donated). The GOTMLS site looks like it was designed in the 70′s and has not been updated since – the footers still show placeholder content. This is all very unintuitive and seems intentionally confusing.
This gives me very little confidence in the code. I give up attempting to use it, and, frankly, regret my donation. Good luck.