I've been a loyal QuickBooks user since my LLC was formed in 1998. I dutifully purchased updates every few years and eventually moved from Windows over to Mac probably around 2004 or 2008.

Sadly this has been the default behavior of QuickBook Desktop for Mac since as long as I can remember. The new Mac OS is released and then the long line of QuickBook customer carnage begins, along with a giant pile of excuses by Intuit support. Thankfully I do not let Apple auto-update my Mac anymore. I've learned this painful lesson more than once with Intuit, and VMWare...both companies seem to require paid updates to their software if you are not running the very latest version...it feels like it is purposeful shake down...

Truth hurts but desktop customers should know by now that Intuit has deprioritized Desktop versions of QuickBooks. They want you on their monthly $$ Online product. As others have noted many companies were ready on Day 1 for Sonoma but not Intuit...They've had all summer to work out the kinks on Sonoma Betas but instead we hear how Apple did not give them time to test. Hahaha. Sorry I do not buy this one minute. 

Ok, here is a solution I have not seen offered to people and I'm not sure why...maybe because it is a hassle...but less of a hassle than uninstalling Sonoma!!

Get yourself Parallels or VMWare or Virtual Box or some Virtual Machine Software. Download an image of Ventura and install Ventura as a Virtual Machine. Install your old QuickBooks onto the Virtual Machine running older MacOS Ventura...and disable auto-updates on your Virtual Machine. Now you can use your Sonoma as normal but when you need to use QuickBooks, you'll have to bounce into your Virtual Machine running Ventura.... this isn't ideal, but it will get you back up and running while you wait to see if Intuit will provide a solution that doesn't involve huge monthly or annual costs...

PS: can someone from Intuit at least be useful and provide a path to purchase QB 2021 while it is still supported? So far the only solution is use QB Online OR pay an huge annual fee AND get excuses for why the software isn't compatible for weeks and weeks...