Apple has released MacBook Air and MacBook Pro Update 2.0 for all laptop models introduced in June 2012: both 13- and 15-inch sizes of the MacBook Pro, the MacBook Pro with Retina Display, and both the 11- and 13-inch versions of the MacBook Air. The minimal release notes say that this release “includes graphics performance and reliability enhancements and improves compatibility with some USB devices.” Requiring OS X 10.8.2 Mountain Lion, the update should appear in the App Store’s Updates screen for affected models, or you can download it directly from Apple’s Web site. If you have one of these models still running 10.7 Lion, it would seem that an upgrade to Mountain Lion would be the only way to take advantage of the update. (Free, 127.07 MB)
Improve Apple Services with AirPort Base Stations
You can make iChat file transfers, iDisk, and Back to My Mac work better by turning on a setting with Apple AirPort base stations released starting in 2003. Launch AirPort Utility, select your base station, click Manual Setup, choose the Internet view, and click the NAT tab. Check the Enable NAT Port Mapping Protocol (NAT-PMP) box, and click Update. NAT-PMP lets your Mac OS X computer give Apple information to connect back into a network that's otherwise unreachable from the rest of the Internet. This speeds updates and makes connections work better for services run by Apple.
MacBook Air and MacBook Pro Update 2.0
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After clicking Download on the Apple page http://support.apple.com/kb/DL1609 I receive an error.
Apple has pulled it.
I tried Software Update (a.k.a. MAS) on my new MacBook Air, and there is no sign of it there either.
I've opened a case to find out what happened to it.