Apple has restricted the allowable downloads is OS 10.7 and 10.8. In order to install the software for this device, you will need to change the settings.
First, open System Preferences from the Apple Button.
Select the Security & Privacy tab on the pop-up window.
Now choose the General Tab, if it’s not already chosen.
At the lower left corner there is a padlock.
It must be unlocked. click on the lock to make changes.
Enter your password and press the “unlock” Button
Choose the “Anywhere” choice. Now click the lock again to prevent further changes. Close the window. You’re now done