Free version only support blacklist and can only have limited list and limited items ( keywords ).
Free version also cannot use the feature of “skip selected notification” and “go to selected confirmation”.
You may go to https://www.bannersky.com/gravity-forms-blacklist-and-custom-validation/ to see all features in the Pro version.
As we don’t come here often so you may contact us on: https://www.bannersky.com/contact-us/