@boan 

You are using QBD 2019, correct? I'm not sure they will release any patches to support Sonoma. I'm also not sure you'll find QBD 2021 with a non-subscription license at this time. If you don't want to pay any annual subscription, consider switching to QB Desktop Windows version to run on Parallels. If you don't mind using the trial version of QB Desktop, you can use it for good to keep managing your multi company files.