Download pbsetup.exe from evenbalance. Install to the bottle where the game needing pb is located. During the install process the pbsetup will open and will let you select the game. Usually pointing to the right directory and as soon as you've added it, it will start to update the client to the current version. Have fun!
Edit: After the pbsetup update you need to go inside the game directory and then you have to copy the pb folder to you Game Directory inside the Documents folder where you override the current pb folder. After that it will just work fine.