I am trying to update to OS X Yosemite. It is asking me for an iTunes Store password of a different email address and I can't change it. What should I do?

  • Presumably you mean trying to chnage the email address - how did you set it and what have you tried – mmmmmm May 9 '15 at 19:56

Open the App Store and on the main page, sign out of the currently logged in Apple ID. Sign in with your Apple ID and then try to click upgrade/install on the Yosemite page.

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