Content Comparison

...

1. Click the Apple menu, and select "System Preferences".
   Image Modified
2. In the top row, click on "Security & Privacy".
   Image Modified
3. Make sure the General button is selected at the top, then look for the section titled "Allow apps downloaded from".
   
4. Click the lock in the lower left corner to make changes, and enter your Mac username and password when you're asked for it.
   Image Modified

5. Under "Allow apps downloaded from:" select "Anywhere" if it isn't already selected. A dialog will pop up warning that "Choosing 'Anywhere' makes your Mac less secure." Click "Allow from anywhere".
   Image Modified

6. Close System Preferences.

...