Clementine

I thought it wasn't working because there's no feedback in the UI that it's downloading, and you don't have an option to only download X latest episodes, so it was chugging through an 1100+ episode backlog.

Hmm ... if it crashes or shuts down it also doesn't pick back up on the downloads in progress. And from what I've seen so far, it doesn't actually auto-download, despite checking the option to to so.

Oh well, getting closer.