The current game version 2.17.1 isn't available at Amazon atm. The release of 2.17.2 was announced today. Will there be an update for Amazon as well?
Check times more closely on that announcement.
Maintenance Update - 16th April, 23:00 PM CDTForce Update - 17th April, 23:00 PM CDT
It likely will be avaliable tomorrow or even day after tomorrow, depending on your timezone.
I think that was perhaps a Google Play only release related to a bug fix. There was no new content in that release if I am understanding correctly. You will probably skip that version on Amazon.
Don't worry, just go straight to v2.17.2 when it is released soon today. v2.17.1 was just for Google.
Game update v2.17.2 is LIVE.