PunkBuster is designed to keep itself up to date using our proprietary auto-update system.
For cases where the auto-update fails, we have created a utility named PBSetup that can manually update one or more installations of PunkBuster.
To use PBSetup:
Download the appropriate version of PBSetup below
Click "Add a Game"
Choose the game you wish to update and confirm the installation path
Click "Update PunkBuster" to update the installations