What format are these files in?
It's not clear to me whether you're saying
A) When I download a standard PDF type file from the magazine website to the Nook HD+ then the download fails.
B) When I download some special app or something for Nook HD+ it fails.
Also, does it work for you if you download to your PC and then move it to your Nook HD+? Or is this some special thing that only works if you access from your Nook HD+ (which seems unlikely).
If it's a download issue then it could be a myriad of reasons
- wifi issues
- the Nook HD+ browser (if you are using the browser). IN that case use another browser like Puffin or Dolphin.
- something about the file type (unlikely).