I got the reader on Amazon, can I upgrade via Google Play ?

The answer is definitely “you can’t” as Amazon and Google Play Store are two distinct companies.
In the field of the Android applications business they can even being considered as competitors, so you can see why there is no bridge between these platforms. As a developer of applications, there is nothing we can do about that, we just upload our updates to their platforms and they manage the sale and download processes.

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