HP Printer Assistant software now comes inbuilt in every Hp printer already after 2009. However, you are missing it in your device then You can download hp printer assistant by visiting Hp website and in the driver and software option. click on install. As soon as you press on it, it will start detecting automatically that which is one of bets compatible version of this and start getting downloaded.   Here if you are facing problem then do-follow link to learn more.