There is no "Download Example Code" link for the book
"Essential Algorithms" by
By Rod Stephens
Ebook: July 2013
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In the Introduction of the book, on page xviii there is a link to the book's page on Wiley's site -
If you scroll down towards the bottom of that page, you'll see the code download link.
O'Reilly Book Support
Unfortunately the link Chris posted no longer works, but this one is current: