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This copy of the Install OS X Yosemite application can’t be verified

I have a 2010 27' iMac with Snow Leopard installed and have recently got a iPhone 6s Plus and it advised i need to upgrade to the latest iTunes but need to upgrade the OS. I have downloaded the install file 3 times from the mac store and each time i try to install I get the following error; "This copy of the Install OS X Yosemite application can’t be verified. It may have been corrupted or tampered with during downloading”


Has anyone had this problem and have been able to overcome this.

iMac, Mac OS X (10.6.8)

Posted on Sep 30, 2015 9:00 PM

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This copy of the Install OS X Yosemite application can’t be verified

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