Amazon Kindle Version Cancelled
The Amazon Kindle version was cancelled due to one popular Fire HD 16 tablet that has a version of Android Kitkat 4.4 which is too old to support Chess Openings Wizard. As there is no way to prevent Amazon customers from downloading an app that will not run correctly on this tablet, the app was removed from the store.
If you have an Amazon Kindle, there is a way to use the Google Play store to order the Android version of Chess Openings Wizard. Amazon makes this difficult but it can be done.
Here are some directions for adding Google Play to your Kindle so that you can then buy the Android Chess Openings Wizard app: