I am trying to use my Hadoop Definitive Guide v3 and upgrade to the pub v4 edition but get the invalid SKU error: Invalid Product(s) - (SKU-KIT-9781449311513.EBOOK).
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I'm not really sure what's going on with that, because that is the ISBN for the 3rd edition ebook and not the 4th.
I sent you an email with the correct discount code to get the upgrade discount to the next edition.
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