Update: March, 2017
With recent OS X releases Apple has removed the option, described below, to allow apps from "anywhere." Control-clicking on the app and selecting "Open" may allow the app to run.
In OS X "Mavericks" (10.9) Apple has a security feature called Gatekeeper that will prevent you from running applications from developers that are not approved by Apple. The Avervision document camera software is one example. If you try to open an application from a non-approved developer, you will get a message similar to the one below. This article will show you how to turn off this setting so you can open any application.
As always, be sure to only install software from trusted sources like the employee portal.
1. Go to the Apple menu and select the "System Preferences..."
2. In the System Preferences window that opens, click on the the "Security & Privacy" icon in the top row.
3. In the security preference window, make sure you are in the "General" area. Click on the lock icon so you can make changes. You will be prompted for your password. This is the password you use to log in to your computer.
4. Change the selection from "Mac App Store and identified developers" to "Anywhere." You will get the warning pictured below. Click the "Allow From Anywhere" button and close the security & privacy preference window.
5. You should now be able to open all applications, regardless of the developer. Remember, only install software from trusted sources like the employee portal.