(Note: If you purchased a Mac between June 11 and July 25, 2012, but it didn’t come with Mountain Lion pre-installed, don’t purchase it from the Mac App Store this way-you’re entitled to a free copy of the new OS. If downtime isn’t an option for you, you might consider holding off for OS X 10.8.1. It could be bug-free, but if the history of OS X is any indication, we’ll see the first update, containing a number of bug fixes, within a few weeks. As I did last year with Lion, I’ve compiled this guide to getting and installing Apple’s latest OS.įair warning: If you install Mountain Lion right when it’s released, keep in mind that you’re installing version 1.0 of a major new OS. This makes it easier and more convenient to upgrade your OS than having to buy and use a DVD or thumb drive, but it also raises a number of questions, and it presents upgrade obstacles for some users. More specifically, it’s available only as a download from Apple’s Mac App Store. OS X 10.8-better known as Mountain Lion-inherits Lion’s distribution method. But Lion changed all that by making OS X available for direct download. When the new owner starts up the Mac, they can use their own information to complete the setup process.Before Lion (OS X 10.7) debuted last year, installing the latest major version of Mac OS X meant buying a disc and slipping it into your Mac’s optical drive. If you’re selling, trading in or giving away your Mac, press Command-Q to exit the setup assistant without completing the setup process, then click Shut Down. When the installation is complete, your Mac may restart to a setup assistant. Your Mac may restart and show a progress bar several times, and the screen may be empty for minutes at a time. Allow installation to complete without putting your Mac to sleep or closing its lid.If the installer offers you the choice between installing on Macintosh HD or Macintosh HD – Data, choose Macintosh HD.If the installer can't see your disk, or it says that it can't install on your computer or volume, you may need to erase your disk first.If the installer asks to unlock your disk, enter the password that you use to log in to your Mac.Click Continue, then follow the onscreen instructions.Reinstalling macOS won’t remove your personal data. When you see a window with the option to reinstall macOS, this means your Mac has started up from Recovery.
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