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You don't need to redownload unless you really need your downloaded copies to be DRM-locked with the new credit card number. NOOK devices and NOOK software should be quite capable of remembering both the old number and the new one.
If you still want to redownload them all, your best bet is to use NOOK for PC (or NOOK for Mac) and select the "automatically download recent purchases" box under Settings>Account Settings. That should get a bunch of them, and for the rest you can do the download within the program (which is a bit less work).
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