How can I up­grade my old iMac to run OS X El Cap­i­tan?

Mac Format - - GENIUS TIPS -

Un­less you pre­vi­ously ‘pur­chased’ the free up­grade to El Cap­i­tan from the Mac App Store, you can’t ob­tain its in­staller from the store now, nor can you use an in­staller ‘bought’ us­ing some­one else’s Ap­ple ID: it’s Sierra or stick with what you have.

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