Heres a recap for everyone to Install HP LaserJet 1020 on Mac OSX. 1)
Download; http://www.narc.ca/1601-LJ_1022_Series_OSX.dmg (Old version)
2)If you have anything for the HP 1020 in «/Library/Reciepts» delete it.
3) Delete anything for the HP 1020 in Printer in «Printer Setup Utility»
4) Add new printer in «Printer Setup Utility», select HP LaserJet 1020, driver should come up, click ADD Then you should be able to print.. glad we finally got around this one.. and one big FU to HP.