I was looking at this tutorial concerning the missing assets, since the Wii U doesn't seem to be able to download them remotely. However, I don't see the bundle.zip the person on githubb speaks about:
https://gist.github.com/WillSams/048430de5a2735dcd9e00e43ee6c578e
https://gist.github.com/WillSams/048430de5a2735dcd9e00e43ee6c578e