OS MOJAVE 10.14.6 (18G103) but same trouble was on latest version of macOS
It is not correct that Discogs import is STILL not working. The inherent problem with the Discogs import is that it uses the HTML output from the server by default, and this output changes often, and I have to adapt the Kid3 code accordingly. Since the last release 3.8.7 on June 20, I had to fix the Discogs import twice. You can always get a development snapshot with the latest changes from https://sourceforge.net/projects/kid3/files/kid3/development/, so you should download the current version from there and you will see that Discogs import is working. By the way, there is also a readme.txt in the development folder, where you could see that it is fixed. If you do not want to rely on this shaky HTML import, you can register at Discogs and get an API key. You can than enter this token in the Discogs import dialog and click "Save Settings". Then you will use the JSON import, which is stable. This is documented in the handbook https://docs.kde.org/trunk5/en/kid3/kid3/file-menu.html#import-discogs.
thank you so much! it's working!