When there is a problem with the software as Garmin Express and Catalina for Mac - it puzzles me that Garmin does neither respond nor react. So Garmin. Please provide an update as to when we can expect Garmin Express to work with Catalina.
That version was issued a few months ago. It does though reinforce the fact you need to keep Express up to date. A map update on a device I rarely used failed a few weeks ago, having ignored the message from Express to update when I ran it. Updated Express and the map update ran perfectly