HT201364: OS X Mavericks system requirements
Learn about OS X Mavericks system requirements
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Q: it seems I got everything to run mavericks and still keep getting this mesage: OS X Mavericks cannot be installed on this co ... it seems I got everything to run mavericks and still keep getting this mesage: OS X Mavericks cannot be installed on this computer. more
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Helpful answers
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Apr 28, 2014 8:15 PM in response to El Mismoby Carolyn Samit,Make sure your Mac can run Mavericks > OS X Mavericks: System Requirements
Make sure you are logged into your admin acccount to upgrade.
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Apr 28, 2014 8:36 PM in response to El Mismoby MichelPM,If your Mac Pro is model ID 1,1, then you won't be able to download and install OS X Mavericks.
Your EFI is not 64 Bit and your Mac Pro's GPU may not be 64 bit addressable, either.