The Google now launcher is technically only for nexus and gpe devices. So any device that's not one of those shows as incompatible in the Google play store. You however install the apk on any device, but you won't get updates from the play store. When new versions come out, you'll have to download updated apks.
Sent from my TouchPad using XDA Premium 4 mobile app
Cell Phone Unlocking is legal again!! That and much … more
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?