@KayIntuit @quickbook @qbsupport  - I am with @SantaMonica2019MacUser , I have a QB 2019 Desktop for Mac installation that is useless right now. I also am a QBO user for another account. This is absolutely unacceptable to have a OS upgrade render the QB 2019 application unusable. I know you have a fix for 2021, but 2019 needs a fix so that we can perform our financial functions.