802.11n update for the iMac

I have a 20" 2 GHz Intel Core Duo iMac w/2 GB RAM 667 MHz.
I bought and am trying to install the 802.11n upgrade to run and it tells me "your computer doesn't meet the hardware requirements".
I have the latest firmware.
Apple's website states "If you have a Mac with an Intel Core 2 Duo processor (except the 17-inch, 1.83GHz iMac) or a Mac Pro with AirPort Extreme, you can enable it to access an 802.11n wireless network using the AirPort Extreme 802.11n Enabler software."
So it should work.
Is there anyone that can give me a clue?

Contact Apple by phone, using the number on the online Apple Store web page. If you explain nicely, they will probably credit the $2 back. I believe the only reason they are charging that $2 is because there is some accounting rule that says if a significant new feature is added to a product that was previously not advertised, the business must charge a fee for it (or something to that effect - I'm not an accountant). Apple is not trying make a profit from this updater.

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