3. Fixing "This Copy of the Install OS X Application Can't Be Verified"
to set the date back to a time when El Capitan was current (e.g., date 0101140016 for Jan 1, 2016). Create a Bootable Drive createinstallmedia mac os x el capitan 10116 installer dmg download fixed
Apple removed El Capitan from the Mac App Store’s “Purchased” section for many accounts. The official download links now often fail. Users report: date 0101140016 for Jan 1