How to add an older episode on Podcast App?

What works for me:

1. In the Podcasts app, go to the "My Episodes" tab.
2. Choose "Feed".
3. You should see the available episodes, and can download that way. (I think that often the iTunes feed only goes back 50 episodes, so if it's older you may need to go to the source's website; and some other podcasts, such as This American Life I believe, only make their most recent episode available.)

You can try this alternative.

1. Install iBooks

2. When you tap in TTMIK feed pdf episode in Podcasts, Safari will launch and give you the option to open in iBooks. It will save a copy on your bookshelf.

You can either email that pdf or reverse sync back to iTunes.

It would seem as though older podcasts are available based on each feed settings which must be set by the podcast producers themselves,

Hence some podcasts will allow you to go back years all the way to episode 1 and some just weeks.

This this is rather disappointing but at leasT Apple did not screw that one up.