When deploying a new OVF template to the vCenter 5.5 host from exported one, you may find yourself in trouble getting it done.
The desktop client may complain about invalid configuration for device 7 which is an extremely misleading message.
According to support forums, to import OVF templates you must use a web interface. However, the web interface complains about the VMWare Integration plugin being not installed. It even offers you to download it.
But here is the trick – whenever you try to install its version 5.5 or 5.6 (since you need ESXi 5.5 compatibility), it simply never works with modern browsers – the plugin is not added to the browser extension list and not detected as installed. I assume this is caused by their enhanced security requirements to the installed extensions. Integration plugin from VMWare requires disk and system access and is silently blocked in newer browsers.
On the original requirements specification of the plugin, its stated its compatibility with IE 7 and 8.
The solution is simple – run your modern IE in the compatibility mode as IE 8! It works like a charm.
Nevertheless, I would recommend quitting the session after you finished using the plugin and come back to IE 11 to not expose your system to risk.