I've just released version 0.20 of Radio Downloader.
The main change in this release is that the entire application and its providers have been converted from VB.net to C#. This due to better support for C#, to enable compilation on other platforms (with Mono), and to encourage contributions (as C# is more popular).
The release also brings some small enhancements and bug fixes. Notable among these are fixes / work-arounds for two issues with downloading episodes from the new BBC station Radio 4 Extra. For a full list of what has changed you can check out the changelog.
Please Note: Upgrading to version 0.20 from 0.18.2 or earlier will reset any application or provider options - this is due to the switch to C#. Your favourites, subscriptions and downloads will be unaffected.