To get the latest features and maintain the security, stability, compatibility and performance of your Mac, it's important to keep your software up to date. Apple recommends that you always use the latest macOS that is compatible with your Mac.

Find out how to upgrade to macOS Big Sur, the latest version of macOS.

It brings OS X much closer to iOS when it comes mac os x 10.8 mountain lion DMG. Mac OS X Lion Free Download. October 19, 2016 March 8, 2017 Muhammad. Mac OS X Lion is a seventh powerful and major release of Mac OS X. It is a standalone Bootable DVD DMG Image installer of Lion OS X.
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Check compatibility

If a macOS installer can't be used on your Mac, the installer will let you know. For example, it may say that it's too old to be opened on this version of macOS, or that your Mac doesn't have enough free storage space for the installation.

To confirm compatibility before downloading, check the minimum requirements for macOS Catalina, Mojave, High Sierra, Sierra, El Capitan or Yosemite. You can also find compatibility information on the product-ID page for MacBook Pro, MacBook Air, MacBook, iMac, Mac mini or Mac Pro.

Make a backup

Before installing, it’s a good idea to back up your Mac. Time Machine makes it simple, and other backup methods are also available. Find out how to back up your Mac.

Download macOS

It takes time to download and install macOS, so make sure you're plugged into AC power and have a reliable Internet connection.

Safari uses these links to find the old installers in the App Store. After being downloaded from the App Store, the installer opens automatically.

macOS Catalina 10.15 can upgrade Mojave, High Sierra, Sierra, El Capitan, Yosemite or Mavericks
macOS Mojave 10.14 can upgrade High Sierra, Sierra, El Capitan, Yosemite, Mavericks or Mountain Lion
macOS High Sierra 10.13 can upgrade Sierra, El Capitan, Yosemite, Mavericks or Mountain Lion

Download Mac Os Mountain Lion Dmg Free Download

Safari downloads the following older installers as a disk image named InstallOS.dmg or InstallMacOSX.dmg. Open the disk image, then open the .pkg installer inside the disk image. It installs an app named Install [Version Name]. Open that app from your Applications folder to start installing the operating system.

macOS Sierra 10.12 can upgrade El Capitan, Yosemite, Mavericks, Mountain Lion or Lion
OS X El Capitan 10.11 can upgrade Yosemite, Mavericks, Mountain Lion, Lion or Snow Leopard
OS X Yosemite 10.10can upgrade Mavericks, Mountain Lion, Lion or Snow Leopard

Install macOS

Follow the onscreen instructions in the installer. It may be easiest to start the installation in the evening so that it can be completed overnight, if needed.

If the installer asks for permission to install a helper tool, enter the administrator name and password that you use to log in to your Mac, then click Add Helper.

Please allow the installation to finish without putting your Mac to sleep or closing its lid. Your Mac may restart, show a progress bar or show a blank screen several times while macOS and related firmware updates are being installed.

Learn more

You may also be able to use macOS Recovery to reinstall the macOS you're using now, upgrade to the latest compatible macOS or install the macOS that came with your Mac.

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This is an introductory tutorial on using InstaDMG, a OSX package and image maker, to create clean never booted disk images of OSX 10.8 Mountain Lion.

Previous tutorials on InstaDMG and OSX 10.7 has three parts, base image, base image + user, base image + user and system modifications.

For those not familiar InstaDMG is a powerful command line tool application used to produce clean never booted OS X images, these images can include OSX incremental upgrades as well as 3rd party software and scripts.

This guide is for getting a clean never booted up to OSX 10.8.4 Mountain Lion Image. You will need the OSX 10.8 installer which is named the InstallESD.dmg

Get InstaDMG

Navigate to your home and create a directory name ‘instadmg’ and change directory to it.

Download InstaDMG.

Updating InstaDMG

As new OSX updates are made available the InstaDMG code is changed to include the new upgrades, to update InstaDMG, move into the directory it is installed in and run the svn update command:

Preparing the Base OS X 10.8 Image

After the InstaDMG is downloaded the next step is to make a base installation image of OS X 10.8 Extract the InstallESD.dmg from the Lion.app after it is downloaded from the App Store and before it is installed, as when it is installed the app is then deleted – this guide shows how to reveal the InstallESD.dmg and also a guide to burn a generic copy of 10.8 to disk.

Move the InstallESD.dmg file from Mountain Lion in the path below in your InstaDMG location and move onto the next section:

Using the Catalog File

The catalog file is the all important file that contains the installer build numbers plus all the incremental OSX updates, the latest version of InstaDMG now has an OSX Mountain Lion 10.8 catalog file as at version revision 480.

– The OSX 10.8 Build number for the initial build is at the top, 12A269, 12B19, 12C54, 12D78, 12E55

– Below are the OSX incremental updates in the format of name, download link and SHA1 encryption key – these are tab separated on one line per item (grab shows them soft wrapped).

– If you don’t want to include a certain update in the build just add a comment (#) to the beginning of the line.

If you only have an older insta