How to Install Mods on Your Satisfactory Server

Satisfactory modding runs on the Satisfactory Mod Loader, usually called SML. Mods are distributed through ficsit.app, and a modded server needs every player to run the same mod set.

How it fits together

• SML is the loader. Mods are folders that SML loads at startup.
• A dedicated server needs the server build of each mod. Some mods are client only and will do nothing on a server.
• Every player needs the same mods at the same versions, installed with the Satisfactory Mod Manager on their own machine.

Install the loader and mods

1. Stop the server.
2. Download SML and the mods you want from ficsit.app, choosing the versions that match your game version.
3. In the panel open Files and go to:

   FactoryGame/Mods/

   Create the folder if it does not exist.
4. Upload each mod as its own folder inside Mods, keeping the folder name the mod ships with.
5. Start the server and read the console. SML prints its version and then a line per mod as it loads.

Mod archives are usually zipped. Extract them first, or upload the archive and use the file manager's unarchive option, so that Mods contains folders and not zip files.

Set up your players

1. Everyone installs the Satisfactory Mod Manager.
2. Install the identical mod list and versions.
3. Join as normal.

A mismatch normally shows as a failure to join or a crash shortly after loading. Publish the exact list and version numbers somewhere your players can read.

Back up before you start

Adding mods to an existing save is fine. Removing them is not, because the save then references buildings and items that no longer exist. Download your .sav file from:

.config/Epic/FactoryGame/Saved/SaveGames/server/

before installing anything.

After a Satisfactory update

A game patch normally breaks SML and every mod until they are rebuilt. If the server starts crashing right after an update, move the contents of FactoryGame/Mods aside, confirm the server runs clean, and add mods back as their updates arrive.

Removing mods

Stop the server, delete the mod folders, and load a save from before those mods were added. Loading a modded save on an unmodded server is the usual cause of a world that will not open.