Mac Help: Software can’t be Opened from an Unidentified Developer

The messages below appear because OS X 10.8 and higher by default block the installation of applications that are not from the Mac App Store or created by identified developers.

Mac Help: Software can’t be Opened from an Unidentified Developer

However, if you know the software you are installing is safe you can follow the steps below to complete the installation: Hold the Ctrl Key down and click on the software you would like to open. Then select Open from the drop-down menu that appears.

The example below shows how to perform these steps for Sophos Anti-Virus

  1. Hold the Control key and click on Sophos Anti-Virus.mpkg. Select Open.

2. Click Open

Mac Help: Software can’t be Opened from an Unidentified Developer