ebook upgrade

Got "Network Warrior" eBook by Garry Donahue. In it the offer:

"Upgrade this ebook today for $4.99 at oreilly.com and get access to additional DRM-free formats, including PDF and EPUB, along with free lifetime updates."

Logged in to oreilly.com, registered the ebook as prescribed, however still unable to upgrade. The item placed in my shopping cart as the result of upgrade request is the entire book at $39.99, not the upgrade at $4.99.

Am I doing something wrong?
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