Can't update 10.4.4 - error: "could not be verified"

I have an iMac Late 2013 and keep getting this error message when trying to upgrade. I was able to upgrade Apple Music separate with no problem but iOS don't want. Please help.

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iMac, OS X Yosemite (10.10.3), Late 2013, 27"

Posted on Jun 30, 2015 10:49 PM

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Can't update 10.4.4 - error: "could not be verified"

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