If you once had purchased an old version of Mac OS X from the App Store, open it and go to the Purchased tab. There you’ll find all the installers you can download. However, it doesn’t always work that way.

The purchased section lists only those operating systems that you had downloaded in the past. Scroll down to find the preferred OS X version.Without App Store: Download Mac OS version as Apple Developer This method allows you to download Mavericks and Yosemite by logging with your Apple ID - only if you previously downloaded them from the Mac App Store. If you are signed with an Apple Developer account, you can get access to products that are no longer listed on the App Store. If you desperately need a lower OS X version build, consider creating a new Developer account among other options. The membership cost is $99/year and provides a bunch of perks unavailable to ordinary users. Nevertheless, keep in mind that if you visit /downloads, you can only find 10.3-10.6 OS X operating systems there.

Purchase an older version of Mac operating system Newer versions are not available because starting Mac OS X Snow Leopard 10.7, the App Store has become the only source of updating Apple OS versions. You can purchase a boxed or email version of past Mac OS X directly from Apple. For the reason of being rather antiquated, Snow Leopard and earlier Apple versions can only be installed from DVD. The email edition comes with a special download code you can use for the Mac App Store.

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