BirdDog Software supports all versions of QuickBooks Desktop 2021 or later. The connector uses qbXML version 14.0 which supports all U.S. editions of QuickBooks 2018 (R16 and above), QuickBooks 2019 (R14 and above), QuickBooks 2020 (R10 and above), and QuickBooks 2021 (R4 and above). However, only QuickBooks Desktop Enterprise 2021 has been thoroughly tested.
Note that only QuickBooks Desktop Premier Plus and Enterprise support Sales Orders. If using Pro Plus then sales orders will not be supported.