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Updates only happen if the publisher requests it. But it is the same at Amazon, the publisher has to intervene to get already-purchased books updated, otherwise only new purchasers get the updated version.
Also some publishers don't actually update the existing book, but instead they remove the old book from sale and add a new edition with the corrections. If this happens then I think the only way to get the updated book is to persuade customer support to add the new edition to your library. Again, it is the same at Amazon.
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