Just a quick post today as I’ve had numerous clients call me recently regarding the same issue with upgrading their vCenter Server…..
If you’re upgrading from vCenter Server 5.5 to a later addition (like 5.5 update 1c), then if you mount the ISO and try to update vCenter using the “Simple Install”, the installer will probably display the following message:
This basically means that some of the components of the update may already be installed. To continue with the upgrade you’ll need to update the individual components under the “Custom Install” option.
… simples….. =)