Hi there, dsbauden.

Thank you for getting back to us. You can download QuickBooks Desktop for MAC 2022 since the service for QuickBooks Desktop for MAC 2021 will be discontinued after May 31, 2024. However, installing the latest QuickBooks Desktop for MAC 2024 would be best to ensure you have the most recent operating system updates.   

Refer to this article for more information: What's new in QuickBooks Mac 2024.

We highly recommend staying with the current macOS to ensure uninterrupted business operations. However, If you prefer macOS Sonoma, we suggest using the supported version of QuickBooks Desktop for Mac 2023 or 2024.
 

I have added a resource you can refer to whenever you face issues with QuickBooks. You can find related articles in this link: Help articles for QBDT Mac.

Feel free to post again or comment if you have clarifications about upgrading your QBDT for Mac program. We'll always be around to assist you further. Have a great day!