From 7 November 2023 Garmin Express no longer supports MacOS versions 11 or older. I have a late 2012 iMac which can only run Catalina 10.15.7. As a previously loyal Garmin customer I am very unhappy about this development. It means I either buy a PC or replace my iMac with a new one, neither of which I can afford to do. I will not be buying Garmin products in the future as a result of this.