hi i tried to update Agenda 11.1 to 11.2 on MacOS10.12.6
from the AppleStore.
Then i had the same message this OP had Update killed my app on 10.12
but in French. I couldn’t open the app anymore.
So I got back a precedent agenda app file from a Time Machine back up, 11.1 again, that seems to work.
Now i don’t know how to get again an updated app from the Apple Store : the button there says now “ouvrir” (open), and no longer “mettre à jour” ou “télécharger” (update or download).