
Update:
As of 11/29/2023, the Nook Windows app is no longer available for book downloads. Hence, use Epubor Nook Converter to decrypt Nook ebooks and audiobooks. Here's the video tutorial:
Download Epubor Nook Converter for Free
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It is still possible to obtain the pre-app Nook software via the Internet Archive's Wayback Machine.
It still works for accessing Nook ePubs, and autiomatically downloads them.
Unfortunately, ePubor's commenting system considers a link to the Wayback Machine to be spam, so I cannot post the link here.
The last backup I found was from February 11, 2012, so searching the Wayback Machine using the Barnes & Noble/Nook URL, and going to that date, and searching for the page with links to the Nook software should do the job.
Thank you for leaving the comments. For the nook drm removing, please contact our customer service (support@epubor.com)to get further assistance. Our customer service will help you back up your purchased nook books.
I will never buy anything from B&N ever again.