Fortunately, there is a very easy workaround for this. Please see the article " Previously Downloaded OS X Installers No Longer Work". If you get this error message it is most likely not a problem with the installer, but rather an expired certificate.
Now let it run until you see the login screen! (Tested to let the progress bar run but no avail.)
#BOOTING UP AND INSTALLING EL CAPITAN FOR MAC INSTALL#
Install & Download your OS X El Capitan in SAFE MODE. When you see apple logo, release the Shift Key.Make sure you have an internet connection about 10Mbps at least. If you have tried changing the date / time / on a startup disk, forget about it. It may have been corrupted or tampered with during downloading” error! I have found the solution for “This copy of the Install OS X El Capitan application can’t be verified. Using command “date 0923020415 “ and it worked. It most likely worked for them because they recently installed/reinstalled "El Capitan OS X installer.app" into their Application folder ntpdate -u ) works for some people, but not for me. I heard setting the date automatically in the terminal (i.e. If you can neither remember nor correctly guess the date you installed "El Capitan OS X installer.app" into your Application folder, then you would have to delete it and reinstall it into your Applications folder so that the digital signature/certficates for the installer is no longer expired.Īlso, setting the date manually in the terminal (i.e. date 0923020415), the installation worked without a problem.
date 03061225616) and it did not work because I installed "El Capitan OS X installer.app" around Sept 2015 and the digital signature/certificates for my installer had expired by now. When I got this error while reinstalling El Capitan OS X, I set the date to today's date (i.e. You have to remember the date you installed "El Capitan OS X installer.app" into your Application folder. I think many people think setting the date to the current date automatically fixes the issue, but this is not the case. By the way this is not a date time issue, date is correct on my computer.
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