The older versions of the Driver doesn't work. I tried to connect to network with version 1.07. On the SIS-Support page this driver isn't listed, but if you are download the SiS630/540 LAN driver, you will automatically get the driver for the SIS900. Maybe there is an error in the web-administrative concept.
Here is the driver, which work with all (I only tried Windows 98) Windows-Versions.