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Helpful answers
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Aug 30, 2016 8:50 PM in response to Kyle_Domoby Carolyn Samit,Hi..
Since this is a used Mac, you may not be able to upgrade to El Capitan because of an ownership issue.
Read here > Changing ownership of a used Mac | Communities
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Aug 31, 2016 1:15 AM in response to Kyle_Domoby lllaass,The 2012 MacBook Pro came with Lion:
What this done before you purchased the Mac?
What to do before selling or giving away your Mac - Apple Support
If not do it