Can't subscribe to a podcast in the itunes store?
How to subscribe to a podcast when you get a "temporarily unavailable" error message:
Find the podcast you want in the itunes store.
Click “get” on an episode of that podcast.
Go to your library. the podcast and the downloaded episode will be there.
Right click on the podcast and select subscribe.
All available episodes will appear and you can download them from there.
Windows, Windows 10