When trying to install from URL, the following error is posted:

It would be very convenient if you could follow the naming conventions other addons follow in your release packages so this would work in the future.

As far as i can tell this needs to be added manually, i tried tagging the latest release with -bc but it did not help. Looking at wowup.io's scarce docs it would seem i need to package a separate archive for tbc and add it to the release. And it seems that not even wowup.io is doing that to their official app. It points to their github as an example on how to do it, but they have not pushed their latest releases in that fashion.

However it works if you point it towards the latest released zip. But then it won't check for updates. But you can also just search for the addon? It installs fine through the normal way.