802.11n Enabler does not work!

I have a MacBookPro with Core Duo. I bought an AirportExtreme Basestation and installed the software... it showed me that it also installed the 802.11n Enabler. BUT: when I go to the network utility program and select "en1" it still only shows a/b/g compatibility. I re-installed a few time, but it wouldn't change.
This, of course, has also the effect that when selecting the 5GHz 802.11n at the basestation, my computer wouldn't find the basestation at all (have to reset it afterwards).

The 802.11n enabler works in Macs with the Core 2 Duo processors, not the Core Duo. I understand that you can upgrade the wireless card by buying a replacement from Apple.
There are other threads here that describe doing this.

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