Since BBC Radio 7 was re-branded to BBC Radio 4 Extra, there have been problems downloading episodes broadcast on this station in Radio Downloader. This isn't caused by anything hard-coded within the application, but by some of the metadata that the BBC generates altering for programmes on this station.
I have fixed the main problem which was causing all downloads from Radio 4 Extra to fail with an "Unknown Error". This fix is available in beta version 0.19, which I'm making available for the moment while I investigate the other issues.
I'll try and make another news posting at some point over the weekend when I've got a clearer idea of how easy the other issue(s) are to fix and rough timescales.