Cast To Character Controller not available

Hello guys!

Im using the plugin for the dielogue system:
(Dialogue System - Game Development - Epic Developer Community Forums)

But i cant seem to get te option -Cast to DialogueController-, I followed the tutorial twice now and i am sure i followed the instructions to a T. I dont get a reply from the original developer thread as it seems to be dead. I am really new to Unreal so i am unsure what to do now.