This error usually points to a corrupted download or an incomplete write to a bootable USB drive. Delete the corrupted file from your Applications folder.
If you try to run an old El Capitan installer, you might see this error: "This copy of the Install OS X El Capitan application is damaged and can't be used to install OS X." mac os x el capitan 10116 installer dmg download fixed
Need the direct download link? Visit Apple’s official support page HT206886 today. Your older Mac will thank you. This error usually points to a corrupted download
The most frequent issue users encounter with the El Capitan DMG is a verification failure. The installer may display an error stating that the application is damaged or cannot be verified. mac os x el capitan 10116 installer dmg download fixed