HP Color LaserJet CP2020 Series - Software Technical Reference

To determine the latest version, compare the overall build number (in parenthesis after the model name)
and the GPD number (in the Driver Files: field). If the overall build number has increased, this is the
latest version of the driver.
If the overall build number is the same, check the version number of the GPD file. The driver that has
the highest GPD version number is the latest driver.
228 Chapter 4 HP PCL 6 print driver and HP PS Universal Print Driver for Windows ENWW
HP PCL 6 print driver and
HP PS Universal Print
Driver for Windows