on Mavericks (Mac OS X 10.9) or Yosemite (Mac OS X 10.10)
1. Launch System Preferences from the Apple Menu
2. Click on “Security & Privacy”
3. Click on the Lock at the bottom of the window:
4. Select “Anywhere” from “Allow apps downloaded from:
5. Download the software if you haven’t yet!
Launch the software, and if necessary, OK the panel asking if it's OK to run this software from the internet.