How to Update HTC One Google Play Edition to Official Android 4.4.2 KOT49H KitKat

Google has already rolled out Android 4.4.2 KitKat OTA update with base firmware KOT49H for the Google Play Edition of HTC One. As the update is a phased roll-out, it will not be available for all users at the moment. It is expected to arrive for all users across the globe soon.