This guide will assist you with the VMware vCenter 6 SQL Express Upgrade process instead of migrating to VMware vPostgres.
VMware
How to Enable Copy Paste in VMware vSphere Client 4.1 and Later
As per VMware, Starting with vSphere 4.1, the Copy and Paste options are, by default, disabled for security reasons. This article explains how to enable copy paste in VMware vSphere client 4.1 and later.