HP Printer Software Update 5.1.1 from Apple Support.
The LaserJet 1020 is a USB-only printer. Since MacBook Airs typically only have USB-C ports, you will need a or a USB-A to USB-C adapter . Plug the printer into your Mac. Turn the printer On . Step 3: Add the Printer Manually hp laserjet 1020 driver for macbook air
Search “HP LaserJet 1020 Mac fix” and look for the foo2zjs driver method – that worked best for me. HP Printer Software Update 5