For more information, please visit http://support.apple.com/kb/HT2368
I have two MBAs. The newest (2.13ghz) one installed fine. The 1.8GHZ one showed the update in the SU control panel. It downloaded fine, but never installed as it did on my first MBA. I tried to run the program myself by double-clicking on it, and I got a message saying it's not supported on this architecture.. odd!
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