Can't Be Opened Because "it is from an unidentified developer"?

By default, Mac OS 10.9 only allows users to install applications from verified sources. In effect, most attempts to install software from the internet or physical media will show this kinds of error messages:

1. "Filmage Editor" can't be opened because it is from an unidentified developer. Your security preferences allow installation of only apps from the App Store and identified developers.

Follow these steps to allow installation of unidentified developer programs:

Go to the Apple Menu (upper left of your screen) -> choose System Preferences... -> click Security & Privacy -> select the General tab. Then, click "Click the lock to make changes".
Enter your username and password into the prompt that appears and click Unlock.
For OS 10.12 and up, click App Store and identified developers. Then choose App store and identified developers. You will be able to install applications downloaded from the internet for 2 hours and then settings will revert.
Exit System Preferences... by clicking the red button in the upper left of the window. You should now be able to install applications downloaded from the internet and open it.

2. "Filmage Editor.dmg is damaged and can't be opened. You should eject the disk image. "

Follow these steps to allow installation:

Go Launchpad -> Other -> Terminal;
In the popped window, enter sudo spctl --master-disable and your password.
Go System Preferences -> Security and Privacy -> General -> under Allow From Anywhere.
Reinstall Filmage Editor.

If you still have questions about how to safely open apps on your Mac, please refer Here.

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