"As previously mentioned by my colleague, QuickBooks Desktop (QBDT) 2019 has already been discontinued and it will not receive any updates. Thus, customers have to upgrade to the latest version to continue using it, particularly for online service features."

I'm no attorney but this one phrases sounds like the basis for a class-action lawsuit.  Thank you for saying that. A "desktop version" implies you can use it for as long as you maintain your desktop.