Hallmark Card Studio for Mac -new for 2020 is NOT supported on MacOS 10.11 El Capitan or earlier. We recommend to upgrade macOS to Sierra or a more recent Mac OS
Hallmark Card Studio for Mac -new for 2020 is compatible with Sierra 10.12, High Sierra 10.13, Mojave 10.14 and Catalina 10.15.
We apologize for any inconvenience.