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If you use Calibre, you can install the epubcheck plugin and check your epubs for errors with it. As to the Nook app, it isn't necessary at all for the use of the Nook ereader.
I haven't bothered either with epubcheck or desktop apps (Nook, Kobo or Kindle). All Kindle, Kobo and Nook ereaders are perfectly usable without any app.
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