Starting with version 1.2.0 our application bcAdmin 4 is compatible to macOS 10.15 or newer. support for older macOS versions had to be stopped due to technical advances. Note that nearly all Apple Mac computers from 2012 onward can run at least macOS 10.15 while most from 2015 onwards can even run macOS 11 or macOS 12. The updates are available for free in the App Store via the built in updater and can be installed without any problems or special knowledge. All of your settings, data and apps are migrated flawlessly.
