Podcasts no longer working; updates to URL don't work

I'm hoping somebody has some experience with podcasts on the Logitech Media Server. I'm running v7.7.2 server software (on Windows XP, using a low-power dedicated server PC; everything else about LMS is working fine) and have the 1.0 Podcast plugin (have not seen any newer plugin release). Until the end of October, my podcasts worked fine, but since then, two of my favorites seem to have switched feeds and I can't figure out how to enter these into the plugin in a way that works.

The shows appear on the Podcasts list as always, but when attempting to access a show, it always returns "Nothing" as if it was picking up the titles but is unable to download or stream the content.

Here's an example; one of my favorites: the John Batchelor Show (URLs were retrieved from the show's old/new podcast pages)

old URL: http://feeds.feedburner.com/JohnBatchelorShow (used this successfully for months, until October 30th 2015, old web page http://johnbatchelorshow.com/podcasts)

new URL: https://audioboom.com/channels/4002274.rss (retrieves show titles, but no content, new web page https://audioboom.com/channel/johnbatchelor)

By the way, I can retrieve and play the new podcast link content on my smartphone, so I know it works. Just not working with Squeezebox, which is preferred for at-home podcast listening.

I'd be grateful for any help how to update my Podcasts plugin settings to fix this problem - thanks!