Late last week a change happened with Google Now Launcher, Google’s first proper attempt at a launcher for Android. It basically became incompatible with virtually every Android phone out there. The change was unannounced and it is preventing anyone from going to the Play Store and downloading the launcher.
Up until last week, you could use Google Now Launcher as your launcher on any Android phone running Android Jelly Bean 4.1 or higher. Now, when you go to the launcher’s page in the Play Store, you get a warning that the app isn’t compatible with your device.