Supported operating system:

Windows XP 32-bit
Windows Vista 32-bit
Windows 7 32-bit
Windows Server 2003 32-bit
Windows Server 2008 32-bit

Release note:
HP Designjet 4020ps printer HP-GL/2 version 7.10 driver for WinXP/2003/Vista/2008/Win7 released on 31th July 2010.

Supported Devices:
HP Designjet 4000 HPGL2/RTL
HP Designjet 4000ps HPGL2/RTL
HP Designjet 4020 HPGL2
HP Designjet 4020ps HPGL2