You can get the *windows* software for the camera from Apple's FTP site. It works just fine on a Windows PC, even in NT/W2K.
The *Mac* software was apparently under some kind of licensing restriction. Back when I used to have a Quicktake 100, after much searching I finally gave up and used it under Windows only.
Your best bet is to find someone who has the camera and have him copy the software for you.
BTW I think the camera will likely be a collector item someday, since it was the first consumer-available digital camera. When I first saw it, I was astonished - there was nothing else like it.
However, as a camera to use these days, I'd use Consumer Reports' famous phrase, "there are better choices."