Problem Requesting Desired Ebook

I recently won a free ebook at the last Philadelphia Area Computer Society meeting. I checked your listings of ebooks and found "INTRODUCING CHARACTER ANIMATION WITH BLENDER, 2ND EDITION" by Tony Mullen, that I am very interested in. After registering and trying to request it, I did not find it in the dropdown list. Is this an oversight? How can I request this as my free ebook?
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