i think he needs a working server.cfg with the right cvars to acivate the mod, the mod only provides the mod itself... probably he needs a working server.cfg for the mod
Honestly I haven't used that mod before. Does it have any guidance or instructions that came with the pk3 file? Usually when you download something it comes with some sort of explanation on how to use it and what it does. Maybe someone else who uses that mod can assist you, but I wouldn't know off hand.
You can download the countdown mod from here Countdown Mod put it on your main/mainta/maintt folder, then use this cvar [set countdown 1] in your server.cfg file to enable the countdown, also use [g_gametype 2] for team match.