Where did you download it from, that book doesn't appear to have a Kindle edition on amazon.com. In any event, the answer is exactly what you got, "The item is not available for this device." Many textbooks are "print replica" books and are not compatible with e-ink Kindle readers. Look at the product page for a link that says "Available on the following devices" to see which devices that book is compatible with.
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You can always reach customer service for help here: amazon.com/contact-us
here's what you'd see if you looked on the product page for a book that gives you that error message with the first one showing you where to click and the second one showing you the available devices for that book