- Mountain lion mac os download install#
- Mountain lion mac os download update#
- Mountain lion mac os download full#
- Mountain lion mac os download plus#
Restart your Mac, hold down the Option key when you see the Apple logo. Now, we will attempt to remove everything from the current OS and reinstall a new copy of OS X Mountain Lion. So we’ve downloaded a new copy of Mountain Lion, copied it over to the USB drive and made it bootable. 
The installation may take about 10 – 20 minutes and once it is done you’ll have yourself a USB drive with a bootable Mountain Lion.
Mountain lion mac os download install#
Drag the formatted drive from the left menu to the Destination field, then drag "Mac OS X Install ESD" on the left menu to Source and click the Restore button.
Now, we are going to create a bootable OS X Mountain Lion in the USB drive. Once the USB drive is formatted, re-select the formatted USB drive from the left menu, and click the Restore tab. Keep a backup of the files within if you still need them, then come back to this section. 
Note: This will remove everything in the USB drive. Under Erase tab, select Mac OS Extended (Journaled) format and click the Erase button.
Select the USB drive on the left menu, Erase tab. Plug your USB drive into your Mac and launch the Disk Utility application. Double-click InstallESD.dmg to open (or mount) it on your Desktop. Navigate to Contents > SharedSupport, then look for the filename "InstallESD.dmg". Look for the file called "Install OS X Mountain Lion", Right-click and select Show Package Contents. Create bootable OS X Mountain LionĪfter your download is done, let’s proceed to making a bootable USB drive with your OS X Mountain Lion in it. Note: This may take up between 10 and 60 minutes, depending on the speed of your Internet connection. If you’ve previously purchased a copy of Mountain Lion, don’t worry, you will not be recharged. Re-enter your App Store credentials if required. Look for OS X Mountain Lion, hold down the Option key and click Download. Launch the App Store and go to the Purchases tab. Here’s how you can download and obtain a soft copy of Mountain Lion. The installer you downloaded from the App Store automatically deletes itself after you’ve successfully upgraded (or install) your Mac. Re-download Mountain Lion Installerįirst, grab hold of a copy of the Mountain Lion installer file. I usually just buy a USB bootable if i missed out on an OS.While I was doing maintenance for my OS X, using the Maintenance app, the app told me that. I think that latest High Sierra is very important as it addresses the Intel chip flaw. Ive found the direct link to sierra and el capitan installers but thats it i think, without having to order through the apple store. You can select your country/language as needed! Just in case people are not aware you can download the MAC OS updates from here.įrom Mountain Lion onwards all downloads are available here. be aware that after installation the installers are removed so save them to a separate partition or drive before running them!! Mountain lion mac os download plus#
I found it works better to run the installers that are saved in the applications folder, rather than complete the install from the app store, plus you can saved the installers for future.
Mountain lion mac os download full#
These links will enable you to download the full installers via the app store, Once downloaded they are stored in the applications folder on your system drive so you can copy/save them first, then run them and install them. Ive found the direct link to sierra, High Sierra and el capitan installers but thats it i think, without having to order through the apple store.
Mountain lion mac os download update#
My Macbook air started to update to High Sierra then stopped and wouldn't complete and wouldn't boot back to sierra either so had to wipe and start again. Update!! just found out you need the original installer before you can use any of these updates and combo installersĪpple really like to maske things difficult these days, used to be able to just download the OS and go.
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