The Management Center OVF does not install correctly on vSphere 6.5. vSphere 6.5 sets the boot option to BIOS, instead of the correct setting for the Management Center OVF: EFI/UEFI.
To workaround this problem, use the vSphere client to deploy the OVF, but change the Boot Options setting to EFI before starting the VM.
Refer to the VMware vSphere 6.5 Release Notes for more information:
https://docs.vmware.com/en/VMware-vSphere/6.5/rn/vsphere-esxi-vcenter-server-65-releasenotes.html#vmissues.