Q: Wireless Aluminum Keyboard Firmware Update

I am trying to install the Aluminum keyboard software update. When I click on the file I downloaded from apple (Jan 25, 2010 - long file name) I get a message that says no aluminum keyboard is connected. The keyboard is on, paired and connected (I can type things; show up under bluetooth, etc). What am I doing wrong? The firmware version is way old (050 vs 321).

Thanks,

Justin