BTW - there is an error in the notification about the completion of the download (at least in PL)
This looks like a bug in LE Settings and/or Kodi. I'll pass it to other developers. I also noticed that on my primary device the notification is not shown, thank you for finding the reason.
Where to download latest nighly tvheadent service for 8.2.2.3?
AFAIK not available. You'd have to compile it yourself.