hi @Jadzia_Dax ,

Do want to validate your license of QuickBooks Desktop 2019 for Mac? Do you have any access to your CAMPS?

https://quickbooks.intuit.com/learn-support/en-us/manage-intuit-account/what-is-camps-and-how-do-i-u...

As the primary user on CAMPS, you may use your registered email address to validate the license during installation process.

Hope it helps.