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$4.99 upgrade button not showing for any of my registered books. Not even the brand new ones?

I could understand for the older books, but the for the newer stuff, like the server 2012 pocket consultant, I don't see any button either.

Would love to buy ebooks for my entire library of the hardcover books that I have been lugging around for the past several years every time I move. they are heavy and don't store well...
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