Nota: these installation supports only Windows 98SE, ME, 2000, XP. There are no MAC drivers.
Download 5420_rel1.0.zip below.
Unzip the file to a local directory.
Run "Setup.exe" by double-clicking on Setup.exe and follow the instructions.
Plug in your device only after you have completed running setup.exe (You should not plug in your device before you run Setup.exe, since the new hardware wizard will not be able to find the driver, unless you have a previous installation).