Install Sophos on Mac OS 10.8

By default, Mac OS 10.8 only allows users to install applications from ‘verified sources’. BOL downloads are not verified; therefore, upon installation you will receive the error message: “Downloaded Program.mpkg” can’t be opened because it is from an unidentified developer. 
 To allow the installation: 
 Go to System Preferences—> Security & Privacy Click on the lock icon in the bottom, left corner and enter the Admin password In the General Tab, under the header “Allow applications downloaded from:”, choose Anywhere. 
 Source: https://kb.wisc.edu/helpdesk/page.php?id=25443