KB ID 0001193
I had a vCenter 126.96.36.199 appliance on my test network and wanted to update it to version 188.8.131.52. But I didn’t want to reinstall the whole thing from scratch.
Let’s assume it’s going to go wrong! Take a snapshot off the appliance first.
Go to the patch update site and get the latest patch for your version of vCenter.
Upload the ISO file into your vSphere storage, and present it to your vCenter appliance.
SSH into your appliance (you can enable this from DCUI, but mine was enabled). Issue the following commands;
shell.set --enabled True software-packages install --iso --acceptEulas
Go get a coffee it takes about 15-20 minutes, when complete it should say ‘Packages upgraded successfully’. You then need to reboot the appliance to complete the upgrade.
shutdown reboot -r Updated