If it is still showing 10.0.3, then you reinstalled 10.0.3. Make sure you are navigating to the 10.0.9 folder when loading into calibre. Then restart calibre. And as Sirtel said, it will need to be no later then Kindle for PC 2.4.0.
The old Android app method may be done anyway. The last time I tried to download with 4.16.0.75, it said something about that version not being supported. It wasn't the ebook either because I was able to download it for an E-ink Kindle, and I got an AZW3 which decrypted without issue.
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