Sometimes, old info can be found on the Internet Archive website (
https://web.archive.org). They have various versions of the old GWV site over the years that you can look at there, but I didn't find any PDFs or manuals in my quick search. They may be there, but I didn't see any.
The Internet Archive is an ambitious site that attempts to chronicle the entire Internet over the years. They're based in San Francisco, but I love the fact that they keep partial backups in the Library of Alexandria, in Egypt. Hopefully, there won't be any more fires there. Caesar isn't around anymore, so they're probably safe.