Even though they're just emailing you a PDF with a license code, it's done manually (so I'm told), so it really does take 1-3 business days to get to you. Go to Apple's web store ( not the App Store app), and search for 'Mountain Lion', and pay $20 for it.

First, you need to buy Mountain Lion (if you haven't bought it already).

Launch the installer and upgrade to Mac OS X Mountain Lion. Copy the “Install OS X Mountain Lion.app” onto the Applications folder of this Mac. Disconnect the external storage from the source Mac and plug it into the recipient Mac. On the Source Mac, open Applications folder and look for “Install OS X Mountain Lion.app“ Plug in your external storage device and copy/burn the installable onto it. Mind you, the OS X 10.8 installable is almost 4.05GB, so you need to have a storage bigger than that (at-least 4.25GB). This method involves copying the Mountain Lion installable onto an external storage device like a USB stick or a DVD drive. In case your Macs are not on the same network, check out the alternate method. Once the file is copied, launch the installer to upgrade to Mountain Lion. Now on your shared Mac, navigate to Applications folder, and drag & drop the Install Mac OS X.app file. Go to your Applications folder and look for “Install OS X Mountain Lion.app“ Press Command+K to Connect to server and then click on Browse to find the other shared Macs. Enable File Sharing by clicking on the checkbox next to it.

On the source Mac, launch System Preferences and click on Sharing. This is because, Mac OS will delete the installer once the installation is complete. Assuming that you have both (or all) your Mac(s) on the same network, you can simply enable File Sharing to copy the installable.ĭownload Mac OS X 10.8 Mountain Lion from Mac App Store. This is the simplest of the 2 methods we have. Install or Upgrade OS X Mountain Lion on More than One Computer # Method 1: File Sharing over the network # If you have a good broadband internet & don’t have to worry about the bandwidth, then you can open the Mac App Store on your other Macs, go to Purchases tab and you can re-download Mac OS X Mountain Lion on each of your computers. The personal use license which came into effect from Mac OS X 10.7 Lion, permits users to purchase once and install the OS on all their computers authorized for personal use. Apple has just released the Mac OS X 10.8 Mountain Lion and I’m sure many of you who own multiple Mac computers will be worrying about purchasing multiple licenses of Mountain Lion in order to install it on all your computers.

Install macos mountain lion