We've created this Forum Thread with some workarounds and advice to assist you in publishing you ebook.
won't let me use my ISBN
I have gotten one book mailed to me, I have made revisions to the cover and manuscript, and am trying to get another print copy. When I go thru the wizard, it won't let me use my ISBN. Says it is being used with another book. Yes, it was my book! How do I swap out the files used in the 1st printing, to get a revised copy of my book? (without getting another ISBN. That is crazy!) Thanks.