A while back, I had bough "Hadoop the definitive guide - 2nd edition" ebook on Amazon Kindle. The book contains a link to upgrade the book with O'Reilly - "Upgrade this book today at O'Reilly for $4.99" - but when I click on the link, it takes me a page that simply says "Invalid Product(s) - (SKU-KIT-9781449389741.EBOOK).".
How do I get the upgrade now?
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That ebook is out of print, which is why you are getting that error message.
There is a 3rd edition out now. I went ahead and added that 2nd edition
ebook to your oreilly.com account for free, since you couldn't purchase it.
Just go to the Your Products page of your account to download it.
O'Reilly Book Support