installing garritan as vst

I cannot get Garritan Personal Orchestra 5 to show up within Cubase.

I have installed Garritan and the Aria player, generated my keycard and dragged the keycard to the Aria player.
I have copied the Aria player VSTs to the Steinberg VSTPlugins folder all to no avail.

They sent me a serial key but I have not had a chance to enter this anywhere. The email instructions they sent were a bit sparse.

Please help.