This article concerns Mac OS X users only
Mac OS X 10.8 and later ones come pre-loaded with software called Gatekeeper which is designed to help keep malicious software off of your Mac by giving you more control over what you install. How it works is quite simple. Gatekeeper will either allow you to run:
Only applications downloaded from the Mac App Store
Applications downloaded from the Mac App Store and from identified developers - which is default setting for Gatekeeper
Any downloaded application
These options can be found in System Preferences -> Security & Privacy -> General Tab
If you need to install a downloaded piece of software that isn't signed by an official Apple developer, Gatekeeper will, by default, not allow you to run it. However, there are several simple ways to bypass this security feature and install the application.
These methods may require administrative privileges.
The simplest and easiest way is to control-click (or right-click) the downloaded app to run/install, and on the revealed context menu, choose Open. On the ensuing dialogue box, choose Open as well. Note that this will exempt this file from Gatekeeper, so, if needed, it can be run again by double-clicking. This is the recommended method.
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