The announcement from CoreCode:
CoreCode Ltd., the developer behind the award-winning MacUpdater software, today announced that it will be discontinuing active development of MacUpdater after January 1, 2026.
As promised, all MacUpdater 3 licenses will be supported until 2026-01-01. After that date we will no longer continue to develop or support MacUpdater but we hope to find some other company to continue the product or its technology: