When it comes to the Nook, SlingPlayer is not supported for that device. Applications for Android tablets and phones are purchased through the Google Play store, and they in fact have the SlingPlayer application. However, the Nook gets its applications through Barnes and Noble and they do not have the SlingPlayer application. I am sorry for any inconvience this has caused and have included a link below that has a list with all of the mobile devices that are compatible with the Slingbox.
You're always welcome to post in our product enhancement portion of our forums with request.
Sling Media Moderation Team