Also, make sure the complete file downloaded to your PC before sideloading it to the Nook. It should be exactly 173,559,808 bytes long. And if you have to download a 2nd or more time, make sure to delete the earlier version you downloaded. Sometimes, if an older version is on your PC, a new version will get a "(2)" (or "(3)", etc.) appended to the file name. If you sideload that file to your Nook it won't update.
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