Follow SIT-Launcher instructions to create a copy of your Live EFT and install latest version of SIT automatically
Ensure that SIT-Launcher installs SIT / Assemblies in the Settings tab
Ensure that you followed instructions to Install SIT Coop Mod and set your Aki Server http.json to your Network card's Internal IP and Coop Mod's coopConfig.json to your External IP
Launch Server and share with your friends your External IP address
Port Forward your Router Port 6969,6970 to your Server's Local Network card's IP address (e.g. 192.1.2.3)
Open Firewall to Port 6969,6970 on your Server and Router
Test your connection by entering your External IP and port into the Launcher and click Launch