Bests & Worsts Reviews from Amazon

Just got a message that the app I had on my Kindle no longer worked on my Android device so I went to the app store and downloaded this one, and it also says it won't work on my Android device. This is a Kindle. I'm told I have to upgrade my device??? It's not that old. Are you going to do this to the video and music apps?? Why should I get another Kindle? I don't understand. And thanks for absolutely NO warning that this was going to happen.... worked just fine yesterday.