Amazon ABE version is 2.2 or something

Has anyone figured out a way to play the latest version of ABE (2.5.1, I think) on a Kindle Fire? The version of ABE available from Amazon Apps was released last August (2.2.1 or maybe 2.1.2?) and I can't play under my Rovio account because my game progress includes things that weren't available in the August version of the game. I tried downloading the Android version from Google/Play but that didn't work. Is there a trick to getting the Android version to work on a Fire?
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