Hi @mgottes
Welcome to the community
The designer may be working on it to update and to make it compatible to the the latest Kodi update.
If you are certain, and I mean this with up most respect, that you made no spelling and input errors, when you downloaded and installed it, then that is the only thing that makes sense to me. Others here on the forum have equally complained of problems with this build.
I suggest an alternative for now; do a clean install of Kodi and download and install one or two add-ons.
Look here for guides:
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