The following page goes over the details of what you have to do to include it into your theme. You do not have to use the licensing system as it will not be installed through the plugins system but rather hard coded into your theme.
The page also includes sample code to show you how to install it.
I also have some sample code if you need it that will disable any existing copies of pro and make yours the highest priority preventing theirs from loading.
https://www.advancedcustomfields.com/resources/including-acf-in-a-plugin-theme/
