upgrade imac OS X 10.5.8 to yosomite

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  • If your Mac's hardware is supported by Yosemite . . .

    Step 1: Upgrade to Snow Leopard (OS 10.6) and do software update to OS 10.6.8. The App Store app is installed with OS 10.6.6 or later.

    Step 2: Download and install Yosemite through the App Store app.

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