Hello. There are two programmes which I can't download via get_iplayer (Windows, version 2.91). They are:
Saturday 14 February, BBC4, 0010, Horizon, Swallowed by a Black Hole, pid=b036bv0z
Sunday 15 February, Radio 3, 1400, The Early Music Show, pid=b00hkc12

In each case I am told that the pid is found in the cache, then that 1 matching programme was found, then that no programme versions were found and that episode-only pid was detected. I am then told that recording is complete, but no download has happened to my PC.

What am I doing wrong?

Until next release, try when "no programme versions found" warning is displayed.

Well, that was a pretty astonishingly quick reply. And it worked, too...
Roll on version 2.92, when whatever it is that is causing the problem is sorted out.
Many, many thanks.