Follow the link in the install docs to the otn site. The link for 8i is at the bottom of the page under the heading of "Archived Products".
If we're only using docbook so that we can generate pdf docs, I have to wonder if there isn't something easier to use I haven't researched this, but it seems that there should be tools that can be used to convert from html, or at least xhtml, to pdf files. That way we could maintain the original docs in html, and convert them to pdf as needed.
