Applicable in: Mac OS X ( OS X Mountain Lion onwards)

DraftSight Version: Mac Beta

Mac Users might come across this message or a very similar "This App can't be opened because it was not downloaded from the Mac App Store", when trying to install DraftSight.

This message, in fact, is not an error message, or even exclusive to DraftSight. 
The message you obtain, is generated by a new Mac OS feature called Gatekeeper. This feature is intended to protect users from malicious software, by blocking the install, but can also affect any application that is not downloaded from the Mac App Store, as it is the case of DraftSight.

How to bypass

In order to bypass this block, you can use two methods:

Method one: Exception for one specific Software

1 - Download the software as you normally would from the internet. If asked if you want to "keep" or "discard" the file, select keep. Note that you should only do this if you are certain you trust the publisher of the software.

2 - Open the software and get the error message that your software "can't be opened because it is from an unidentified developer." Click OK.

3 - Try opening the software again but this time right click on the software. (You can right click on a Mac, by pressing ctrl and clicking simultaneously). Select open from the menu.

4 - You should now be given the option to open the software. Click "open".

Method two: Permanent Exception for all Software

Note:

Lowering your Gatekeeper settings leaves your system at risk of acquiring possible malware. Restore your settings after installation to reduce the risk to your system.

1 - Click the System Preferences icon on your Dock. Alternatively, you can click on the Apple icon in the top left of your screen and then click "System Preferences."

2 - Click Security & Privacy. It will be located under the heading "Personal."

3 - Click the lock in the bottom left of window. Enter your password when prompted. Then, click Unlock.

4 - Click the box next to "Anywhere." This will be located in the "General" Section, under "Accept Applications Downloaded From: ". You will now be able to install your software as normal. Click the lock again if you wish to prevent further changes.

Note: While it can be annoying, the Gatekeeper feature is designed to protect you. If you do set your Mac to allow all software to be installed, make sure you’re certain that the software you are installing is legitimate.

For more information about GateKeeper, please refer to Apple Support (http://support.apple.com/kb/ht5290).