Oh shoot. I was pretty sure I had tried with Captvty and it didn't work before! Could be that the latest version was made to work with it (I had tried at the beginning of the games). Edit: Yes, the release notes state the the latest release was made to be compatible with the Rio 2016 content, so I am right in saying it did not work with it before.
Seems to be downloading!
I can't believe it's working! It's so simple. No need for command codes, no need to find the manifest, etc. Could it really be?
Thank! I'll let you guys know how it goes!