How do I turn off automatic software updates with SYNC 4A?

To turn off Automatic Updates:

1. Tap the Vehicle icon on your SYNC screen.
2. Select Systems Update.
3. Toggle the Automatic Updates option to OFF. A confirmation pop-up will appear.
4. Tap Continue. 

Important: If you set Automatic Updates to OFF, your vehicle will not automatically download and install software updates which allows Ford  to deliver software updates that are designed to make your vehicle better over time. Switching OFF these updates will mean manually accepting each update that is sent to your vehicle. To learn more about how to accept Ford  Software updates for SYNC4/4A please click here. 

Additional Information

How do I accept software updates using SYNC 4A
How do I view software updates details with SYNC 4A 
What are Ford Software Updates