So the install guide says SQL 2014 Express isn't supported. Web site says it is supported.
I try and install EPO 5.9 onto a VM (2012R2) with SQL 2014 Express and I get:
Not having a good time with McAfee lately.
Download the new ePolicy Orchestrator (ePO) Support Center Extension which simplifies ePO management and provides support resources directly in the console. Learn more about ePO Support Center