I have setup a vCenter 5.1 machines and was trying to deploy an OVF.
When I select "Deploy OVF Template" via the web client, the wizard loads and I get a yellow error, "the current platform does not support ovf functionality".
I have not been able to find much information on this, I am licensed for ent+ and vCenter std.
I worked it out. I was using chrome or safari on the mac, even thou I was using a supported chrome version I could not get the client plugin until I moved to a windows machine. Then installed the client from the bottom of the web login page.