Upgrade from OS 10.6.8
How do I upgrade my iMac 7,1 from 10.6.8 to a higher OS?
How do I upgrade my iMac 7,1 from 10.6.8 to a higher OS?
Back up your data, check your applications for compatibility, click here, and then on the download link for El Capitan.
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Upgrade from OS 10.6.8