Make sure you reboot after the drivers have been installed. Next make a DSN to the SQLBase database engine. The information you need to enter is quite straight forward but keep in mind that you need to enter a UNC path to the sql.ini file of the machine where the database engine is installed at.
Next, within a DTS you should be able to import data by choosing a Gupta DSN or Gupta OLE DB Provider and voila!
It doesn't look that dificult at all but it still took me two days to get it working.
Now that I know a little SQLBase, I have to say it's a quite interesting product. I think I might fiddle with it for a while.