Install HD+
Install HD+ on an Android device
There's several ways to get the app on an Android device
I'd recommend enrolling in the beta version as well as it'll be updated frequently
Note: I don't update the Amazon App Store version as often as the Play Store.. if you want more frequent updates on an Amazon tablet or device, you might want to install the APK below and use the Check For Updates option built into the app
Direct Download (version info)
Make sure you disable automatic updates in the Play Store otherwise it'll replace the direct download version with the one from the Play Store

Once installed you can update in-app using About -> Check for updates

The direct download version contains a few extra features that aren't allowed in the Play Store including
The app runs on Android Jelly Bean (API 18) and newer devices
Last updated