HT201541: Update the software on your Mac
Learn about Update the software on your Mac
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Helpful answers
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Sep 17, 2015 6:21 AM in response to phamngocdiepby BobHarris,If you truly have a "Core Duo" then that is a 32-bit CPU chip.
You need to have a Mac with at least a "Core 2 Duo", which is a 64-bit CPU chip. As are the i3, i5 and i7 chips.
But the "Core Duo" is only 32-bits.