How to Resolve “This copy of the Install OS X Mavericks application can’t be verified.” Error


It was 2AM last night and I simply gave up. After 6 different downloads, three USB drives and numerous attempts, I was defeated.

I could not get Mavericks to install on my 2011 MBP. I had already cleaned out the drive in an attempt to start fresh and was SOL.

I’ve been following several threads on Apple Support forums about this same issue and found a single post (thank you Jonathan) that outlined a very simple solution to this problem…your Mac’s time.

Apparently when the software is being downloaded, part of the verification is date and time, so make sure to check your machine’s date and time to see if it’s off.

I simply ran the date command in terminal and saw that my MBP was showing January of 2001…weird.

I then ran the same command with today’s date, see below…

date 102613152013

After running the command I closed Terminal and attempted to run the Mavericks install again…here I am typing from that same machine two hours later.

I hope this resolves the issue for most of you experiencing it. If there are other solutions please feel free to share with others in the comments below.

Note: This workaround may resolve the following error, “This copy of the Install OS X Mavericks application can’t be verified. It may have been corrupted or tampered with during downloading.”

  • Achim

    Thank you so much ! Worked for me , and also thanks for the comment how to Type the Date correctly!

  • chesterbr

    Thank you, this was a life-saver

  • Elena-Beth Kaye

    This was just what I needed, thank you. To save others some additional googling, here is how to know what to put in for the date:

    date {month}{day}{hour}{minute}{year}

    Every bracket should be replaced with a two-digit number. For example, November 8th 2013 2:50pm would become the following command:

    date 1108145013

    • Redbaron


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  • Thank you so much for this. I blew away my installation without thinking of checking for any issues like this and couldn’t figure it out, but you saved the day!

    • Claude68

      had the same problem and could solve it:

      Installed OS X Mavericks on an external HD and booted the MacBook Pro from that HD by pressing CMD – R.

      Open Disk Utility; Restore HD of the MacBook Pro: Source: External HD Partition with the Mac OS – Target: MacBook Pro HD.

      Next time booting from the internal HD – worked fine.