Starting today as I tried to download the new Alt+F1, the authentication for the premium podcasts RSS feed started failing for me, deleting and recreating the feed didn't fix the problem.
I am on iOS 8.3 using Downcast 2.8.32, which i've been using for years (obviously not that version though).
I am also getting the same failure on the premium bombcast feed. I can access both of them when logged in on the web though. Based on the comments for Alt+F1 I might not be the only person experiencing this.