I have the "Programming Google App Engine, 2nd Edition" Kindle edition on my iMac and my Kindle Fire. I am asking about the ebook upgrade item...
What is in the upgrade, i.e. what date or App Engine version does it service?
Also, when I download the upgrade how do I perform the actual upgrade on both devices?
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Thanks for your interest in Programming Google App Engine. The updates are to correct errata or formatting issues and aren't huge changes to the content of the book.
To get the updates on multiple devices please log in to your O'Reilly account and re-download the ebook each time you're altered that there is an update.
In the ebooks area of "Your Products" you can see when a particular ebook has been updated. I hope this helps and have a great day!