Let me take it from here, Drcreative.
Each software has different licenses. Having said that, the QuickBooks 2020 Mac license will not work on other versions or upgrades.
Also, the software will work on at least macOS 10.14 (Mohave); supported by macOS 10.14 (Mojave). For more information, check this reference about system requirements for QuickBooks Desktop 2020 and Enterprise Solutions 20.0.
If there's anything else that we can do for you, please feel free to let us know.
