HT201475: Upgrade to OS X El Capitan
Learn about Upgrade to OS X El Capitan
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Helpful answers
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Jul 25, 2016 10:42 AM in response to Amit123jandeby Esquared,Is this what you tried? Authorize your computer in iTunes - Apple Support
Do you get any kind of error message?
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Jul 25, 2016 7:46 PM in response to Esquaredby Amit123jande,no
actually after clicking to sign in noting happen
after clicking authorise this computer nothing happens