Mountain Lion Installer

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  3. Mountain Lion Installer App Download

Users can now download and install OS X 10.8 Mountain Lion from the Mac App Store. Apple wants users to download it on each system from their store, but that can take up precious time and bandwidth. Why not download it once and then install from that download to each system.

Jul 25, 2012 Mac OS X Mountain Lion Installer by Apple Inc. Publication date 2012-07-25 Topics Mac OS. Download Mac Os Mountain Lion Installer Free Download Mac OS X Mountain Lion 10.8.5 latest version standalone offline DMG image for your Apple computer. Mac OS X Mountain Lion 10.8.5 is a very powerful and reliable operating system for your Macintosh computer with different enhancements and improvements.

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For example, I use a MacBook Pro, MacBook Air and a Mac Mini. Why must I download the upgrade three times on each system?

Users don’t have to download the upgrade on each system if they follow the steps below for creating a DVD or USB install disk with Mountain Lion’s upgrade installation on it. The user can also work with an SD card but that’s not recommended since some machines might not boot to an SD card.

The easiest option includes installing a really simple utility. I recommend this easy option, but if a user doesn’t want to bother with third-party software, even if it is free and safe, then we offer a second alternative that takes a little more work.

Before performing either method of upgrading, be sure to follow our guide for getting ready for Mountain Lion.

Use Lion Diskmaker App

The option involves downloading and installing the free app Lion Diskmaker. The app looks for the downloaded installation files in the Application folder. Download the Mountain Lion installation files from the Mac App Sore then run the free app. It finds the files and then burns them to a flash drive or DVD.

I recommend using the USB option since it runs the installation faster than a DVD and future Macs likely won’t ship with a DVD drive.

Do the following:

  1. Download the Mac App Store Mountain Lion install files but don’t actually update your version of OS X at this point.
  2. Run the Lion Diskmaker and follow the app’s instructions using an 8GB USB drive or double layer DVD. Note single layer discs won’t work and the app will erase the USB drive.
  3. Test the DVD or USB disk to see if the app burned the files correctly by doing the Mountain Lion update from the disk (boot the computer while the holding down the Option key).

This should update any system with Mountain Lion.

DIY Method for Those Wanting to Avoid 3rd Party Software

Note that I’ve not tested this procedure since the first one works so much better, but it should work fine. Thanks to Lifehacker for the steps.

  1. Download the Mac App Store Mountain Lion install files but don’t actually update your version of OS X at this point.
  2. Open the Application folder and find the installer app and right-click it to and choose Show package contents.
  3. Find the InstallESD.dmg file inside the Contents > SharedSupport folder.
  4. Open the Disk Utility app in the Utilities folder under Applications.
  5. Drag the installESD.dmg image file into the sidebar on the left of the Disk Utility app.
  6. Insert either a blank double-layer DVD or an 8GB USB drive.
  7. DVD Users only: Select Burn after selecting the DMG image file and then boot from the disk by restarting the Mac and then holding down the Option key as it books up. Choose the disk as the startup option and install Mountain Lion. Quit here.
  8. USB Users only (from here to end): Select the USB disk in the Disk Utility and choose the Partition tab and select 1 Partition from the drop down box and Mac OS Extended (Journaled) in Format type.
  9. Click Options and choose GUID Partition Table.
  10. Hit Apply to erase and partition the drive so it will boot properly.
  11. Click Restore and choose the DMG file as the source and the USB drive as the destination and hit Apply.
  12. Boot the Mac with the USB drive by holding down the Option key as the computer starts and then run the update.

These steps work but they’re much more complicated. The above Lion Diskmaker app makes this much simpler.

For users with a cluttered system that suffers from instability, this might offer a great time to erase the system and install a fresh installation of OS X. Back everything up and make sure all the software installation files and their activation serial numbers or keys are accessible.

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  • Reinstalling Mountain Lion

Upgrading from Mac OS X 10.7 (Lion)

Mac OS X 10.8 (Mountain Lion) is no longer available for purchasefrom the Mac App Store. If you have Mac OS X 10.7 (Lion), and yourcomputer meets the systemrequirements for OS X 10.11 (El Capitan), you can upgrade directlyto that version instead; see ARCHIVED: Install or upgrade OS X 10.11 (El Capitan)

Download And Install Mountain Lion Free

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Reinstalling Mountain Lion

To reinstall or recover Mountain Lion, you must have an activeInternet connection. If you are on campus at Indiana University,UITS recommends the wired Ethernet network instead ofwireless. However, if IU Secure is your only option, seeConnect to an IU wireless network in macOS if booted from your Recovery HD

Reinstalling while keeping files, applications, and settings

  1. Restart your computer, and immediately hold down command-r until the gray Apple logo appears.
  2. If prompted, select your main language and then click the arrow.
  3. Click Reinstall OS X, and then Continue. Follow the instructions on the screen, and then choose your hard disk. Click Install, and enter your Apple ID information if prompted.
  4. When the installation is complete, select App Store... from the Apple menu, and install any available updates.

Mountain Lion Installer Dmg

How To Download And Install Mountain Lion For Free Windows 10

Mountain Lion Installer Usb

Reinstalling while erasing everything on your computer

Mountain Lion Installer App Download

How To Download And Install Mountain Lion For Free Pc

  1. Restart your computer, and immediately hold down command-r until the gray Apple logo appears.

  2. If prompted, select your main language and then click the arrow.
  3. Click Disk Utility, and then Continue.
  4. In Disk Utility, from the left column, click your harddisk. Select the Erase tab.
  5. Next to 'Format:', make sure Mac OS Extended (Journaled)is selected. Next to 'Name:', give your disk a name.
  6. If you would like to securely erase your data, click SecurityOptions..., adjust the slider accordingly, and clickOK. When you're ready, click Erase..., andthen Erase again to erase your disk. When the processcompletes, quit Disk Utility.
  7. Click Reinstall OS X, and then Continue. Followthe instructions and then choose your hard disk. ClickInstall and enter your Apple ID information if prompted.Once the installation is complete, you'll be asked to enter basicinformation and have the option to transfer data from another computeror a backup.
  8. Select Software Update... from the Apple menu and installany available updates.