Navigate to System → Package Manager → Available Packages.
Locate pfBlockerNG-devel.
NOTE: pfBlockerNG-devel is installed instead of the standard pfBlockerNG.
pfBlockerNG-devel is much easier to configure and is extremely stable and should have no issues being used in production.
Click the Install button and wait for it to complete.
NOTE: Once installation is completed, pfBlockerNG appears in System → Package Manager → Installed Packages.
Return to Install pfBlockerNG or continue to First Install Wizard.