My Urzagatherer app doesn't seem up to date

Hello. I use a Mac and I installed the Urzagatherer app. It worked well so far and when a new extension released I received a notification that the app had been updated.

However, the last extension Adventures in the Fogotten Realm still doesn't appear in my app and when I go in the "about" section, it shows that my version of the app is v6.6.3 although it seems that the latest version should be 7.5.0.

How can I update my app ? I haven't found.

Thanks for your assistance and this beautiful app.