Catching up here...seems like 'jpMist27' and I were/are in the same furrow...
I am pleased to report that I now have two Mini's working again with the XMLTV guide service. It hasn't been "auto-updating" but I see from recent posts that it needed a final line (</plist>) so I'll try that. The XMLTV listing for my Spectrum cable service in Florida on a coupe of channels I like doesn't match it's actual channel number, but I will try the EyeTV gear "Add Channel manually" for them and see if that works. 'EYEMISSELGATO's' "export/import" suggestion did work at restoring channels for the second disabled Mini, but since the Time Machine "restore" worked so well on the first, I just did it again on the second.
The new Mini is still in the box but working with it is "up to bat" for this weekend. It has the 6-core i7 processor, the 1Tb SSD storage, and 16 Gigs of RAM so I'm expecting it to blaze compared to its nearest (Late 2014) predecessor with a 1Tb "fusion" drive. Never thought I'd pay $2,000 for a Mini though <gasp>, but at almost 80 nearly ancient years, it is likely to be my last!. I am determined to configure it with 'EYEMISSELGATO's' successful "schedules direct" guide solution using the "how-to's posted awhile back. Wish me luck!