How do I download and install the printer driver for the M506?

You can download drivers by going to 123.hp.com/laserjet and clicking Download (HP Easy Start), or by visiting www.hp.com/support/ljM506 and selecting software and drivers. You can also install from the printer CD (Windows only), or download the HP Universal Print Driver from hp.com/go/upd for IT-managed setups. (Page 5)