No Stone Warden after registration

[berrybashirian]

I have registered my game, I can see Stone Warden addon, but even after I've selected a dwarf it is not visible in the available classes. What can I do?

[Erenion]

Stone Warden is (as of 1.6 iirc) no longer the donator class, it is now a basegame class.
Possessor is the donator-only class, Stone Warden is available to anyone but needs to be unlocked.

Unlock conditions are (SPOILER):
having 10 levels in wild-gift talents and 10 levels in spell talents on a dwarf character.