Baldur's Gate : The Sword Coast Chronicles : NWN2 Persistent World

I've noticed some custom classes such as Frost Mage and Thauma being shown on the NWN2 builder when I followed links by people, yet these classes arent available on my account.

Is there anyway to load the BG subclasses etc to the NWN2 builder?

Pick Kaedrin pack when build PC's on there, but keep in mind even those classes were altered.

Thanks bob