octfac51.zip is still around courtesy of http://www.doomworld.com/mellow/bots.shtml on his https://www.doomworld.com/3ddownloads/mellow/ page.
Run with doombot using the following arguments:
-deathmatch -warp 1 -skill 5 -ctf -file ikbastex.wad octf.wad -nodes octf.nod +teamplay 1 -playdemo octfac51 +exec ctfteam.cfg %1 %2 %3 %4 %5 %6 %7
Now, this is so archaic that it would be a miracle if anyone managed to get it to work and it probably isn't worth it but I didn't want to lose this. Enjoy, if you dare!