(latest release thread:
https://forum.kodi.tv/showthread.php?tid=371457)
It should be working from the official repo. The version in Gade's repo is now outdated.
Perhaps there was a hiccup getting it on Kodi official repo. It was added less than 24 hrs ago, so maybe.
I noticed that this page,
https://kodi.tv/addons/matrix/category/skins , appears to be very confused. Maybe related. Heck might just be somehow on my end (clear cookies?)
I would recommend either waiting a little longer or go to
https://github.com/manfeed/skin.EllipsisUI and download as ZIP and use that to install the latest EllipsisUI on Kodi 19.