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If you buy something through one of these links, we may earn an affiliate commission. 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. 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 installation procedure is easier and quicker than ever. Assuming you want to do so, click Continue twice. 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.
Read the warning and click Continue. First Aid runs and reports any issues it finds. Individuals who are in a hurry to update to a new OS often forget to back up first. It doesn't matter what backup method you choose. Some popular options are Time Machine , your favorite third-party backup application , or a clone of your startup drive and all of its data.
The important thing is to have a current backup in case anything goes wrong during or after the installation. Delaying the installation for a few minutes to perform a backup is better than recreating your data because the power went out during the installation process. You can also install the OS on a non-startup drive. Unlike this process, which requires you to create bootable media first, there are no special techniques required for a clean install on a non-startup drive.
Because the target is the startup drive, you have to erase the drive first, which erases the OS X Mountain Lion installer. To avoid this catch, create a bootable copy of the installer and then use it to install the OS on the blank drive.
This optional step creates a bootable copy of the Mountain Lion installer. With it, you can perform a clean install of Mountain Lion on your Mac's startup drive, as well as boot from and run Disk Utility and other emergency tools. Actively scan device characteristics for identification. Use precise geolocation data. Select personalised content. Create a personalised content profile.
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