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Upgrade from print version to ebook - Ebook upgrade button does not seem to work

I have purchased the 'Print Book' version of two titles that it are still in early release stage. Can I get a copy of them in their current form? There is 4.99 Ebook upgrade button, but when I press it I get an error 'Invalid Product(s) - (SKU-KIT-....". The books I am interested in are 'Deep Learning' by Adam Gibson, Josh Patterson and 'Fundamentals of Deep Learning' by Nikhil Buduma
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