3ZB2 (3rd Zigock Bot II) webpage is (and AFAIR always was) working just fine, with all stuff there in place: ponpoko.tri6.net/3zb2. They are indeed probably the best bots for Q2 available to date.
While 3ZB2 bots are not totally dumb even without waypoint (route) files, they still greatly benefit from them. There are many pregenerated chain (*.chn) files available for most popular DM and CTF maps on its homepage. Routes for the new maps must be generated manually, like this:
/set chedit 1 /map yournewmap ... run around the map for a while (don't do fancy stuff like RJ and GJ) ... /sv savechain /set chedit 0 /map yournewmap ... now add some bots and see if anything had improved ^_^ ...
There is also slightly modified/improved version of these bots by Dmitry Briliuk (aka Reanimator's Edition) but it's pretty old stuff, and I do not have a link handy ATM.