How to Upgrade the vCenter Applicance from 5.5 to 6.0
1. After downloading the appliance from vmware.com/downloads, start by installing the client integration plugin. This step is needed for new installs or upgrades. Firefox was used for this procedure.
2. Once the client plugin is installed, begin the upgrade. Make sure that your appliance has a static ip and that DNS records are in place. Notice the captures carefully.