I did a test install on a laptop first as I have been bitten before with new OS's.  It would not let me in so I uninstalled QB for Mac 2021, removed the Plist and let Hazel clean up the rest.  After re-install at least I could open my data file but also found I could not use the Home button or the Home from the menu bar list.  All else seems fine.  I have been using Quicken, Quickbooks and Turbo Tax products for over 30 years and I find this very frustrating and boarding on unethical the way Intuit seems to have no problems screwing with their clients.   I will ALWAYS prefer to have the software installed on my hard drive and handle cloud backup of my data myself.   I really do not appreciate always feeling like I am being leveraged into QB Online.  They even make it very difficult to find the Desktop version for Mac on their website.  Shame on the decision makers.   Shame!