The supported SQL versions in KDA 11.0 are SQL Server 2008, 2008 R2, 2012, 2014, 2016, and 2017.
The supported SQL versions in KDA 11.1 are SQL Server 2008, 2008 R2, 2012, 2014, 2016, 2017, and 2019.
Desktop Authority will install Microsoft SQL Server 2014 Express Edition on the Operations Master server during a fresh installation. Or any of the above existing SQL instances can be used.
Note: The only supported KDA versions at this moment are version 11.0 and version 11.1. Please see the complete KACE Desktop Authority Product Life Cycle Table here. Highly recommended to upgrade to the latest KDA version in case running an old KDA version. Latest KDA version can be downloaded here.