check what your ip is go to internet paste that click enter and look for Port forwarding then, tcp/udp 20100 to 20103. i would help you on team viewer but im guessing your from Egypt and i wont be able to read your computer
When you enable Client adition, then there is H&S and Zombies included with it.
It does require people to download, but as gold got a bunch of egy's too, we mainly use the client addition servers for events or for people that just want to play with custom maps and such.
is there currently any servers running h&s if there is. i might start playing again