Updates are available, but Amazon sends out an email notification that people have to take the time to reply to.
This is due to the way that highlights, notes, etc. are tied to the copy of the book that will be replaced and Amazon doesn't want any more lawsuits for wiping out people's notes without warning. So they make you request the new version explicitly. They really ought to have an "Export Notes to My Clippings" function.
People who haven't bought your book before will get the latest version automatically upon purchase.
Hope this helps.
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