You can't download non-B&N e-books directly to NOOK. You have to download them to your computer, then sideload them to your NOOK.
thankyou so much for that, I have now successfully got the books onto ADE, I even purchased another to make sure it was working properly.
But now, even though I have dragged them into my nook, I cannot see them on the nook, do I have to have wifi connection for this to occur??
I tried dragging and dropping again, but it said file already exists, so it has gone over, it's just not showing up on the nook. I am almost there, just need to fix this little problem now!