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We're doing some system upgrades over the weekend and so the code isn't working. We're on target to resolve it Monday, but don't hesitate to contact our customer service at 1-800-998-9938 / 707-827-7000 / email@example.com. They can take care of you first thing in the morning.
We've made some upgrades to our $4.99 ebook upgrade that greatly simplifies the process. Here's what you do:
1) Register your print books at http://oreilly.com/register/ .
2) Click the $4.99 upgrade button and purchase the ebook.
3) Download your DRM-free ebooks in the format of your choice and enjoy.