If you load the coop menu you can select the map in the list if you scroll down, you dont want to set the game to zombies but select it from the coop-map list ( when you have the mod loaded obv ).
Then you should be able to play with friends just like any other zombie map..

eetrigger = getent( "eetrigger", "targetname" );
eetrigger waittill ("trigger", player);
eetrigger delete;
player giveweapon( "tesla_gun_upgraded" );

You say it is coop, but how do you create the lobby with the map to invite your friends. We both have the map working correctly but i dont know how to form the lobby for the map.

Sorry for the late reply, just s...

And how would you launch it coop? cause when me and my friend try to launch it, It crashes his game.

Make sure you both have ( the same version ) of T4m, and both have their texture settings set to 'manual...

Both, solo and coop

Thanks for the kind words, glad you enjoyed the map and the mod! O0  
I understand what you mean about the EE ending, guess we should have added a reward or something..