Thank you for dropping by the Community and sharing your concern about upgrading QuickBooks Desktop for Mac, Cruiseman. We understand that you have downloaded the QBDT 2021 installer while currently using QBDT 2019 for Mac. Let me share some information that could help you.
Just to set your expectation Mac OS Sonoma is no longer compatible with 2019. In case you want to continue using the QuickBooks Mac 2019. To be able to continue using QuickBooks MAc 2019, you will need to have an OS Catalina 10.15 to OS Monterey 12.0.
On the other hand, yes, you are correct. If you run the QuickBooks Desktop Mac 2021 installer, it will allow you to pay for an upgrade to the 2021 version and continue using your Desktop QB. During the installation process, you will be prompted to enter your payment information and complete the upgrade. And QuickBooks Desktop Mac 2021 is compatible with Sonoma. You should be able to run QBDT 2021 smoothly on Sonoma-based Macs.
I'll leave these articles you can use to help you in the future:
Feel free to post here again if you have further QuickBooks-related concerns. We are available 24/7 to lend a hand with each of your queries. Stay safe!
