“App is Damaged Can’t Be Opened” Error Message in mac OS Sierra is a common error when you try to install a non-AppStore app. See this tips to fix fix it easily:

1. Open a Terminal with appropriate privileges (“sudo bash” to make you root on most systems)

2. Enter the following, substituting “AppName” with the real name of the app:

xattr -cr /Applications/AppName.app

3. Press Enter to run the command.


Your name of Apps shouldn’t have Space character. Exp: Cleanmymac 3 -> Cleanmymac3

This should remove the flag currently set on the app.

Here is a related tip for macOS Sierra. The option to allow apps from anywhere has been removed. Well, hidden actually.

GFA Team / Internet