- Launch System Preferences and click on it. (type command + space and type 'system preferences')
- From here click on the Privacy & Security icon in the top row.
- The General tab is where we want to be.
- the lock-icon in the bottom left should look unlocked. If it is not, click on the lock and type in your password. This will allow you to make changes to your settings.
- click "Anywhere"
Anywhere will allow any app to be opened regardless of the source or developer.
Once you've made your changes, click the lock icon again and go ahead close the window(click the little red circle x in the top left) and exit out of System Preferences altogether.