[gbm]

I would try:

1. Download the library books to ADE
2. Open in ADE to check good download.
3. Close ADE.
4. Connect Nook--I leave my nook in sleep mode for all file transfers just seems to have less problems.
5. Open your file manger/file explorer.
6. Use the file manger/file explorer to copy/paste or drag&drop the books to Nook.
7. Eject Nook.
8. Wait a couple minutes for the Nook to finish file operations.
9. See if the books are there.

OR

1. Create a calibre library just for library books.
2. Import the downloaded library books into calibre
3. calibre will not be able to open them but can be used to transfer to Nook.
4. Connect Nook--in sleep mode.
5. High lite the library books you want to load then send to Nook.
6. Eject Nook.
7. Wait a couple minutes for the Nook to finish file operations.
8. See if the books are there.

bernie