If you did not buy, download, or install Mountain Lion from the App Store with an Apple ID, this will not work. This works even if it was originally on another Mac than what is currently in use. To be able to get the older version of OS X from the Mac App Store again, you must have obtained OS X Mountain Lion from the App Store at some point in time, thus tying it to your Apple ID and Mac App Store account.
Finally, do not attempt to install OS X Mountain Lion on a newer Mac that shipped with OS X Mavericks pre-installed, the installation of 10.8 will fail because it does not support the newest hardware while 10.9 does. If you’re experiencing unusual problems with Mavericks, you may want to try a clean install. Users who wish to downgrade from OS X Mavericks to Mountain Lion should follow these instructions instead, but be aware that it requires a backup from the prior OS X version. Using the downloaded installer will not work to revert from a Mac with Mavericks to Mountain Lion. Important Note: This is really a trick aimed at advanced users who know why they want an older version of OS X. With OS X Mountain Lion officially off the App Store though, you can’t just search for it and choose to re-download, but that doesn’t necessarily mean users can’t retrieve the installer again. Additionally, there are circumstances where users looking to update from Snow Leopard or OS X Lion may want to go to OS X Mountain Lion instead of Mavericks for compatibility reasons, or to avoid some of the potential issues discussed here by readers with Mail app and iCloud syncing that have frustrated some using current versions of 10.9.1 (those are since resolved with 10.9.2, update to avoid those issues). Though it is generally recommended for users to keep their Macs up to date with the latest system software, not everyone wants to run OS X Mavericks on all of their Macs, and in some situations older Macs may not support the latest version of OS X anyway.
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