How to update from 1.2 to 1.3?

It will be a question of childish ignorance on my side, but I don’t understand how I can update from version 1.2 to version 1.3.

When I go to the Devonsphere page in the App store, I am told that Devonsphere is installed on my Mac. It is indeed installed, yes, but version 1.2, not version 1.3. And I see no button for downloading the latest version. How can I solve this?

How stupid of me! Thanks, Korm!