This version has now been made the stable version of gnus, and its version number is 5.8 (For the stuff from my book to work, it is important that you get this version!) The version is available from the Gnus home page.
To install it, simply untar the file, and type ./configure and
make, and insert the following into your .emacs file:
(setq load-path (cons "/home/blackie/Emacs/gnus-5.8.2/lisp/" load-path))You should of course replace /home/blackie/Emacs/gnus-5.8.2/ with the path to the location where you have gnus located.
There is one bug in Gnus, however, which you will bump into if you follow the description on page 342 (That is the section called Incorporating Old Archives). The information available there simply doesn't work in Gnus - yet!
So if you want to add an old archive to your folder list, simply press G f (gnus-group-make-doc-group) in the group buffer. And then type the name of the file.