vCenter

I am trying to update my 5.5 update manager to 6 and I am receiving a message stating "The vCenter Server is incompatible with the VMware vSphere Update Manager you are installing. Please select a compatible vCenter Server." I upgraded vCenter from 5.5 appliance to the 6.0.0 build 3339084 appliance. The update manager that I downloaded was the vCenter 6.0u3B. Do I need another version for the appliance? I am installing update manager on my existing Server 2008R2 5.5 update manager server.

Based on your vCSA build number you're running vCenter Server Appliance 6.0 Update 1b and you need the Update Manager on the same version.