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)
Go Back and Forth Fast in Preview
If you're reading a PDF in Apple's Preview software, and you follow a bookmark or an internal link to move around within the PDF, you can quickly return to where you were by pressing the keyboard shortcut Command-[ (that's Command-Left Bracket). Or, you can choose Go > Back.
The command works iteratively, so you can go back to just the previously viewed page or if you issue the command again, to the page before that, and so on. There's also an equivalent Go > Forward (Command-]).
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.