I have Vcenter installed as an appliance and the update manager installed on a windows 2012 server.
When I go to the web client for VCenter I cannot see the Web plugin for the Update Manager, how do I get it installed?
what does your Client Plug-Ins page show? Mine looks like this:-
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Have you tried re-registering it using the VMwareUpdateManagerUtility.exe ?
See here for detaills -> vSphere 6.0 Documentation Center
Tried that just there and stil the same.