HT201372: Create a bootable installer for OS X
Learn about Create a bootable installer for OS X
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Helpful answers
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Jan 7, 2015 12:49 AM in response to _mxbby Roger Wilmut1,I'm afraid you can't. The requirements for Yosemite are the same as for Mavericks (as are the requirements for Mountain Lion) so you can upgrade to either of those. Mountain Lion is available in the Online Apple Store.
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Jan 7, 2015 8:41 AM in response to _mxbby Eric Root,If you previously downloaded it from the App Store, check the Purchases tab. You can make a bootable USB stick to install using this free program.