First of all you need server files, If you don’t have I recommend to use this one: Download. Then you need to put your ip (check here) in the following files: HMLserver, WLserver, Gate server and Gserver, these are found in folder Gameservers.
Gate Server:
HMLserver:
WLserver:
If having problems with router, guides is coming soon.
Gserver (Elvine):
I recommend this program for changing ip: Download
Now comes the client editing, first download Frhed in download section. Then Download this plain 3.51 Client. Later open Frhed and open client with it, press ctrl + f, and type checksum error, which will bring you to the client’s ip, replace it with your ip.