![]() ![]() Open up a terminal window, using the Utilities > Terminal menu option.It may have been corrupted or tampered with during downloading.", then it means that the system time on your laptop is too far in the future for the certificates contained in your installer image (they expire a certain time after you originally download the installer). If you’re getting an error like this saying "This copy of the Install OS X El Capitan application can't be verified. To boot from the installer, reboot your Mac and hold down the alt/ option key, and it will let you You should see output like the following-it might take a while to finish. Sudo /Applications/Install \ macOS \ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install \ macOS \ Sierra.app -nointeraction
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