Mountain Lion 10.8.0 Download Dmg

If you want a separate copy of Mountain Lion, then you will have to purchase and download it. Apple does not supply a freely downloadable copy via the App Store. Rather it is through Internet Recovery should it be required. See OS X (Lion/Mountain Lion)- About OS X Recovery. If you download your own 2nd copy then you can make a bootable installation flash drive:


Make Your Own Mountain/Lion Installer

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  • I bougth a Lion copy about a year ago. Now I want to do a clean install on my Mac so I've to download the dmg of Lion from App store. Anyway from App Store I can't no more find my Lion purchased copy.

Download Mac OS X Mountain Lion DMG File Installer for version 10.8. Free download and experience Apple's OS X 9th edition with brand new features. Nov 08, 2011 Here is how to download a full disk install version of lion.


1. After downloading Mountain/Lion you must first save the Install Mac OS X Mountain/

Lion application. After Mountain/Lion downloads DO NOT click on the Install button.

Go to your Applications folder and make a copy of the Mountain/Lion installer. Move

the copy into your Downloads folder. Now Quit the installer.


2. Get a USB flash drive that is at least 8 GBs. Prep this flash drive as follows:


a. Open Disk Utility in your Utilities folder.

b. After DU loads select your flash drive (this is the entry with the mfgr.'s ID and size) from the left

side list. Click on the Partition tab in the DU main window.

c. Under the Volume Scheme heading set the number of partitions from the drop down menu to one.

Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the

partition scheme to GUID then click on the OK button. Click on the Partition button and wait until

the process has completed.

d. Select the volume you just created (this is the sub-entry under the drive entry) from the left side

list. Click on the Erase tab in the DU main window.

e. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the

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button for Zero Data and click on OK to return to the Erase window.

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f. Click on the Erase button. The format process can take up to an hour depending upon the flash

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drive size.

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3. Locate the saved Mountain/Lion installer in your Downloads folder. CTRL- or RIGHT-click on the installer and select Show Package Contents from the contextual menu. Double-click on the Contents folder to open it. Double-click on the SharedSupport folder. In this folder you will see a disc image named InstallESD.dmg.


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4. Plug in your freshly prepared USB flash drive. You are going to clone the content of the InstallESD.dmg disc image to the flash drive as follows:


a. Double-click on the InstallESD.dmg file to mount it on your Desktop.

b. Open Disk Utility.

c. Select the USB flash drive from the left side list.

d. Click on the Restore tab in the DU main window.

e. Select the USB flash drive volume from the left side list and drag it to the Destination entry field.

f. Drag the mounted disc icon from the Desktop into the Source entry field.

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g. Double-check you got it right, then click on the Restore button.


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When the clone is completed you have a fully bootable installer that you can use without having to re-download Mountain/Lion.


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Note: The term Mountain/Lion used above means Lion or Mountain Lion.


As an alternative to the above (you still have to do your own download of Lion/Mountain Lion) you can try using Lion DiskMaker 2.0 that automates the process of Steps 2 through 4.

May 29, 2013 2:11 PM

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