Upgrading your QuickBooks Desktop Mac is irreversible, gate. Once upgraded, you can no longer roll back to a lower version.
It's still possible for you to use the QBDT Mac 2020. The discontinuation also causes the unavailability of some functionalities including payroll, Credit Card processing, and banking. Therefore, the option to import to QuickBooks Online is also unavailable unless QBDT is supported. See this for more details: QuickBooks Desktop 2020 service discontinuation policy.
If you're all good, check out this extra guide on how to manage your bank feed: Create rules to categorize transactions in QuickBooks Desktop.
The Community is available 24/7 in case you need more help with data management, importing, or QuickBooks in general. Take care always!
