Thanks for this great piece of software. Worked fine so far. When I tried to open now, it got stuck while displaying "Read directories". It also displayed "new version available" but the update-button did not work either. So I deleted everything I could find with mp3tag including the files in the libraries and download the latest version. As I had assumed that Wine is still installed I first tried the version without Wine. When that did not work I download the version with Wine. None of them works. The app does not open nor show any error message.
I opened a Terminal window, went to the Applications folder and opened the app from there. The result error code was :
"LSOpenURLsWithRole() failed with error -10810 ".
Can anybody help with that?
Thanks a lot in advance. 
Did you have a look at this thread:
Wine on macOS Sierra
Hallo Ohrenkino,
danke, das war es tatsächlich. Der Ordner hatte allerdings keinen Punkt vor dem Namen.
Thanks, that fixed the problem, though the folder was named "deMp3tag..." without dot at the beginning.
I know I deleted it originally, but likely got reinstalled in my first attempt without wine.
Thanks a lot for this solution!
Not sure how to put this topic to solved, so leave that to admin.
kind regards,
Harald