Alphatrack in Cubase 5 on a Mac

I have Cubase 5 on a Mac (10.7). I connected my Alphatrack. The Alphatrack Manager is set to “ProTools HUI”.

I dragged the “AlphaTrackCN” file to LIbrary/Application Support/Steinberg/Content. Is that the correct location?
AT does not show up in the “Devices” in the “Device Setup” nor can I add it.
I can choose “Mackie HUI”, then the transport works. The fader works only on the first track.

I can choose no other tracks on the AT. If I choose another track in Cubase, I still cannot control it with the AT.

Can someone tell me what I am doing wrong?