Ah, here we go. The UK site linked me to Deutschland (Germany), where I found this very nice page:

http://www.umax.de/support/treiber.htm

Note that if you enter the Powerlook 2000 as your scanner you'll be offered the MagicScan 4.5 software, which I've heard is nicer than VistaScan and compatible with the lower end SCSI scanners.

It also appears that one may order a CD with all their drivers on it?