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If you can find the download email we sent to you when you made the purchase, the download links in that email will always point to the latest version of the book, so you can use those download links to get the latest version of the book.
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Interested in creating your first Leanpub book? Here are some quick tutorials for our most popular writing modes: http://help.leanpub.com/en/articles/3088382-quick-walkthroughs-for-getting-started-on-a-leanpub-book