Ah yes, that reminded me I didn't look to see if the animations were tied into the animator. On looking into that, the animations have no attached motions. Although the controller is switching between animation states and it is trying to run them. But even if I manually assign an animation, say idle down since it is default, still there's no sprite assigned to any renderers. Any luck on your end?
Update: I reimported it again and made a little progress. I can now see all the other animations for the character except idle. No motions are assigned to idle in the animator, but are assigned for the other animations it would seem. If I manually assign the idle animations, then all works well. But something's definitely not working right with the process.