You can add additional add-ins to your QuickTest Professional installation by running the QuickTest Professional setup again and choosing the modify option.
You can get to the QuickTest Professional setup by going to add/remove programs, highlighting QTP and choosing ''change'' or by running the installation media again.
By default, a functional testing license comes with all the add-ins available. So if you purchased a functional testing license from HP, then you have all the add-ins available to you. The default install does not install all of them, only a short list. During the initial install, if you do a custom install, you can choose additional add-ins.