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I think you need to verify/clarify whether you are dealing with an update or a new edition. If I understand correctly, updates (which only apply to ebooks) mostly involve making corrections (typos, factual errors, etc.), much akin to a patch or service pack that is issued for a piece of software to resolve bugs. A new edition (2nd edition, 3rd edition etc.) typically contains substantial new content and is treated as a new book. If years ago, you purchased the 3rd edition of the American Heritage Dictionary, you would not expect to receive the 4th or 5th editions for free, nor would you typically even get a discount on them. They are treated a separate books altogether.
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