Mountain lion installer app download

Fortunately, there are alternative ways to perform a clean install on a Mac when the target for the installation is the startup drive. Before you can perform a clean install of Mountain Lion on a startup drive, you must create a copy of the Mountain Lion installer on bootable media. Use the guide to prepare your bootable media. If you're going to install Mountain Lion on your Mac's startup drive, you must first restart your Mac from a bootable copy of the installer because the startup drive is erased before you perform the installation.

Do this using Disk Utility, which is included with the installer. The on-screen prompts provided by the installer take you through most of it, but there are a few tricky spots. When your Mac reboots, a progress bar displays the time remaining in the installation. The time varies depending on the Mac, but it should be relatively short — less than 30 minutes in most cases. When the progress bar hits zero, your Mac automatically restarts, and you are prompted for information.

The Desktop appears. It's almost time to start exploring your new operating system, but first, a little housekeeping. You'll probably be tempted to start checking out Mountain Lion immediately, but before you do, it's a good idea to look for software updates. Select Software Update from the Apple menu and follow the instructions for any updates listed.

After you install any available updates, you're ready to go. Install Os X Mountain Lion. When you download Mountain Lion, the installer starts automatically. Quit the installer and read the rest of this guide before starting the installation process. A supported Mac. A target drive or partition. The target volume must be at least 8GB in size. You can squeeze Mountain Lion onto a smaller drive, but there won't be much space left for user data and applications. A minimum volume size of at least 60GB provides sufficient room for the OS, user data, apps, and some free scratch space.

It contains a bootable system with utilities for performing basic disk repair, as well as the ability to reinstall the OS if necessary. A current backup. For most people, this is Mac's startup drive. If you haven't already performed a backup, you can find instructions in the following guides: The Target Drive for the Clean Install of Mountain Lion This guide covers performing a clean install of Mountain Lion on a startup drive.

Insert the bootable media or connect it to your Mac and then restart the Mac while holding down the Option key. This causes the Mac to display its built-in startup manager, where you select the device you want to boot from. Use the arrow keys to select the bootable Mountain Lion installer you created earlier and then press the Enter key to start the boot process.

That's why you made your own bootable media. Select Disk Utility from the list of options and click Continue. Select your Mac's startup volume from the list of devices in Disk Utility. You should download the Then as the next step is set the location on where you have to get insatllESD. Second method is you can perform the El Capitan Download for version Your Mac also needs at least 2GB of memory and 8. MacBook introduced in or later, plus MacBook inch, Aluminum, Late MacBook Air introduced in late or later MacBook Pro introduced in mid or later Mac mini introduced in early or later iMac introduced in mid or later Mac Pro introduced in early or later Xserve models introduced in early Time Machine makes it simple, and other backup methods are also available.

Learn how to back up your Mac. It takes time to download and install OS X, so make sure that you have a reliable Internet connection. If you're using a Mac notebook computer, plug it into AC power. For the strongest security and latest features, find out whether you can upgrade to macOS Catalina, the latest version of macOS.

Search icon An illustration of a magnifying glass. User icon An illustration of a person's head and chest. Sign up Log in. Web icon An illustration of a computer application window Wayback Machine Texts icon An illustration of an open book.

Books Video icon An illustration of two cells of a film strip. Video Audio icon An illustration of an audio speaker. Audio Software icon An illustration of a 3. Software Images icon An illustration of two photographs.