– The app has been altered by something other than the developer. Gatekeeper options are found in Apple menu > System Preferences… > Security & Privacy > General tab (El Capitan shown below) under the header 'Allow applications downloaded from:'Įven with Gatekeeper turned off, if you get the 'Damaged App' message, you still won't be able to open the file
The problem that you are running into is that Gatekeeper is trying to protect you from malware and not only doesn't recognize the developer 'signature' of the App you downloaded it 'sees' the file was modified by someone/something other than the developer.
