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I usually end up using podbay.fm for finding rss feeds for shows which don't list them on their web pages (or anywhere else). https://podbay.fm/p/software-unscripted

Here it is: https://feeds.resonaterecordings.com/software-unscripted (that URL was surfaced by my subscription in Overcast).

I haven't really used the Apple podcasts website before but apparently I can find it there.