Flying Daggers Mutation - Only able to play as Adventurer

[xakuvo]

So i've been attempting the Flying Daggers Mutation and I've gotten SOO close with the assassin, but now when i play Flying Daggers I can only play as the adventurer, no matter which class I select. I am able to play other game mods as other classes but Flying Daggers is forcing me to be the Adventurer. I've started a new game, quit the game entirely, and tried using other modes and standard but i still have the issue.

[undead]

Hero's class in Flying Daggers is modified version of adventurer and is preset by the game to be always the same.