As for the current thread title, I don't see any way to download 360 demos at all on Xbox One. BC, as far as I know, only applies to full games. I must have missed something in the thread. Thought I read everything.
I think Lost Odyssey is already installed on this console. I'll see if she can play it without me.
*Says she has to buy it--I'm going to the XBL Marketplace*
*Says she has to add payment info*
I guess that's a no. Can't buy 360 games on Xbox One without payment information. Even if they're free.