Currently we have a small VMWare vCenter cluster. Only two hosts and a virtual instance running the vCenter. The entire environment was built on ESX 5.0. Not update 1. Now we're ready to make a leap to 5.1 during this week's patching cycle. The Update Manager software was never installed and we do not have the original "VIMsetup-all" matching the build number. Now I cannot install Update Manager as the download isn't available on VMWare's website. All I can download is 5.0 update 1 which won't install because of the version differences.
If I go on the vCenter webUI and hit update (in an attempt to level out the versions) it fails.
Am I stuck installing a newer instance of vCenter or what? I guess I feel like it should let me install Update Manager 5.1 to bring everything else up to date... but it doesn't work that way.