
Here I am writing tutorial for you. Not sure it will work but, %90 will work anyway
1-Download this:

and setup it...
It has fake users feature, so with it you can multiclient all games
2-Copy your game folder and paste it on another localation and rename it.
We are doing this because Xigncode is not letting you to run it 2 times at same time
Lets say your main game folder name : nader, and copied one: nadercopied.
2- Go to nader folder (which is your main game folder) and run the game. Start the game connect to server etc.
3- Go to nadercopied folder (which is your copied game folder) and right click on the game and select "Run in ReHIPS DeployHelper as administrator "
Here you go, enjoy