To upgrade to the latest version of the vCenter Server Appliance, you must use the Client Integration Plug-In. All of the installation files necessary for the vCenter Server Appliance upgrade are included in an ISO file which you can download from the VMware Web site.

Before you upgrade the vCenter Server Appliance, download the ISO file and mount it to the Windows host machine from which you want to perform the upgrade. Install the Client Integration Plug-In, and then start the upgrade wizard.

The upgrade of the vCenter Server Appliance is a migration of the old version to the latest version, which results in deploying a new vCenter Server Appliance 6.0 on a host running ESXi 5.0 or later. The configuration settings of the vCenter Server Appliance that you are upgrading are migrated and applied to the newly deployed vCenter Server Appliance. The new appliance is assigned a temporary IP address to facilitate the upgrade from the old appliance. The IP address and host name of the vCenter Server Appliance that you are upgrading are applied to the vCenter Server Appliance 6.0 as part of the upgrade process. At the end of the upgrade, the vCenter Server Appliance that you upgraded is powered off.

Important: If the vCenter Server Appliance that you want to upgrade is configured in a mixed IPv4 and IPv6 environment, during the upgrade, only the IPv4 settings are preserved. In a DHCP environment, the vCenter Server Appliance upgrade fails if the vCenter Server Appliance you are attempting to upgrade and the vCenter Server Appliance 6.0 run on hosts that are in different networks.