Just because the Play Store blocks you doesn't mean you have to throw your device away. Because Android 4.4.4 supports APK sideloading, you can manually install the final version of Netflix that worked on KitKat.
Resolution Limits: Most older devices running KitKat will be limited to Standard Definition (SD) playback. Even if you have a Premium Ultra HD plan, the hardware and software limitations of Android 4.4.4 usually prevent HD streaming. netflix para android 4.4.4