If Penny Press publishes a new version of a book but keeps the same title and ISBN, we normally update the ebook sold on Amazon. If you have purchased the book via Amazon you will automatically receive the update if you first turn on automatic updates, as follows:
Preliminary step to ensure synchronisation of your notes, bookmarks etc between the original and the new book.
If your device is a Kindle Fire HD, Kindle Fire HDX, Kindle for Windows 8, and Kindle for BlackBerry 10 then Whispersync for Books (Annotations Backup) is enabled automatically on and can’t be turned off.
If you have any other device, make sure Whispersync for Books is turned on for your device or Kindle reading app to sync your notes, highlights, bookmarks, and furthest page read.
Next, enable Automatic Book Updates as follows:
1. Go to Manage Your Content and Devices (www.amazon.com/mycd).
2. Select the Settings tab.
3. Select “On” under Automatic Book Update.