Rekordbox / virtual audio cable / output channels / ddj 400 / windows

Hey,

I have been trying to route a virtual audio cable through rekordbox for legal live streaming under the new twitch licensing program. However, I don't seem to have the same option as other people when it comes to selecting output channels(as seen below). It doesn't seem to be an option for me...

I've updated rekordbox, done all that. But there is no option for output channels.