The ColorMunki Smile software application will not run on Mac OS X 10.15 and higher because they require 64-bit applications. Mac OS X 10.15 Catalina was released on October 7, 2019. This new Mac operating system requires applications to be 64-bit compliant. ColorMunki Smile software is a 32-bit application, and will not run on Mac OS X 10.15 Catalina. There are no plans to develop a 64-bit application for ColorMunki Smile. The i1Display Studio and i1Display Pro devices have 64-bit applications that will run on Mac OS X 10.15 Catalina. To continue to use the ColorMunki Smile on a Mac, you will need to avoid upgrading to Mac OS X 10.15 Catalina. If you decide to upgrade to Mac OS X 10.15 Catalina, you should consider upgrading to the i1Display Studio or i1Display Pro.