Open (from the Utilities menu in the installer or your Applications folder).
: If you already have an earlier version of El Capitan (like 10.11.0) and just need to reach 10.11.6, use the OS X El Capitan 10.11.6 Combo Update Steps to "Fix" Common Installation Issues mac os x el capitan 10116 installer dmg download fixed
If you have seen error messages like “This copy of the Install OS X El Capitan application can’t be verified” or “The installer information is corrupted” — this guide is for you. We have compiled the methods to download a clean, original 10.11.6 installer DMG that works. Open (from the Utilities menu in the installer