One of the scripts you mention is an old one, and has been superceded by the other script, which is basically an update for the old one.
The B&N DRM, unlike the ADE-DRM which Sony uses, works like a username/password combo across any version of all the files, and is not keyed to only work on a particular device.
The B&N software is not needed, either to download files (which you can get directly from the My NOOKlibrary page on their website) or for providing the info to unlock the books. You'll probably also be able to transfer the files directly from your Nook to your computer via USB.
B&N have promotional free books you could test it out on. See the Deals forum, where people often post the latest ones, and see if there's anything you might like to read.
Hope this helps.
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