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.
Before proceeding, be sure to read my article on getting your Mac ready for Mountain Lion , which covers system requirements and recommendations, as well as a number of tasks you should perform before upgrading that will help make the process go smoothly. Assuming you meet the requirements , getting Mountain Lion is easy—for most people more on that below.
Visit this Apple web page for details. Specifically, the 4. On my Mac, the installer even automatically launched after it finished downloading. On cable-model connections around the U. To download the installer on a Mac other than the one on which you purchased it, you just launch the Mac App Store application, click the Purchases button in the toolbar, and click the Download button next to OS X Mountain Lion in the list.
This is obviously a much faster approach than re-downloading the 4. Downloading the installer onto a Mac already running Mountain Lion : If you already have Mountain Lion—either the official release or the golden master the final developer release, a. One of these two methods should let you download the installer. Similarly, if you're a developer who previously downloaded the "golden master" GM of the Mountain Lion installer, the Mac App Store app may claim Mountain Lion is "Installed" on your Mac—and thus not let you download the official release—if the Mac App Store app detects that installer on any connected volume.
If this happens to you, the solution is either to delete the GM installer after compressing it or copying it to a removable drive if you want to keep it handy or, if possible, to disconnect the drive on which the GM resides. So if, as explained above, you plan to use the installer on other Macs, or if you just want to keep the installer on hand, before installing you should copy the installer to another drive—or at least move it out of the Applications folder.
The Mountain Lion installer if you've opted to show all disks. The installation procedure is easier and quicker than ever. Assuming you want to do so, click Continue twice.
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After installing Mountain Lion on a blank drive, you can transfer your data from another Mac, a Windows PC, another hard drive, or a Time Machine backup. Click Other Network Options to use Ethernet instead. If you opt to transfer accounts and settings from a Snow Leopard or Lion Mac or drive, the setup procedure will continue much as if you upgraded from Snow Leopard or Lion, respectively. The first time you boot into Mountain Lion, you may be alerted to known incompatible software.
The latest version of OS X, But before you rush to install Mountain Lion, you'll Mountain Lion OS X Though you can install Mountain Lion directly from your Mac's hard drive, a bootable installer Some Mac users prefer to do a "clean install" of each major new version of OS X, erasing their Mountain Lion sold 3 million units in the first four days, making it Apple's most successful OS X release to date.
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Installing Mountain Lion: What you need to know
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Purchasing and downloading Mountain Lion
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