Not sure what you mean about not being able to choose 32 or 64 bit for the Bluestacks instance. Switching to 32-bit Nougat is how I finally was able to get a backup.ab from Kindle for Android 4.16.0.75. Then I simply used the included file app to export my books to Windows. But that version isn't downloading new books anymore. I haven't attempted to update to a newer Android version since other easier methods are working.
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