Why Are My Space Engineers Mods Not Working After Installing?

Published June 9, 2026 · By Host Havoc Technical Support Team

If your Space Engineers mods are not loading after installation, the most common cause is a mismatch between the World Name in SpaceEngineers-Dedicated.cfg and the actual save folder being loaded by the server.

This guide also applies after uploading an existing world to your server.

How the mod installer works

When you install a mod from Steam Workshop, the installer writes the mod ID into the Sandbox_config.sbc file of the save specified in the World Name field of SpaceEngineers-Dedicated.cfg. If the World Name does not match the folder name listed in LastSession.sbl, the installer cannot find the correct save and the mod will not load.

Steps

Check which save is loading

  1. Log in to the Game Control Panel and stop your server.
  2. Go to Configuration Files and open LastSession.sbl using Text Editor.
  3. Find the <Path> value. It will look similar to: <Path>C:\TCAFiles\Users\username\123456\ServerSaveData\Saves\MyWorld</Path>
  4. Note the folder name after \Saves\. In the example above, the save name is MyWorld.

Match the World Name

  1. Open SpaceEngineers-Dedicated.cfg in the Config Editor.
  2. Find the World Name field and make sure it matches the save name you noted in Step 4 (for example, MyWorld).
    • Alternatively, you can update LastSession.sbl to point to the world name already set in SpaceEngineers-Dedicated.cfg. If you change LastSession.sbl to a new world name, the server must run at least once to generate the save file before mods can be written to it.
  3. Save your changes.

Reinstall mods

  1. Click the Steam Workshop (Installed) icon in the control panel.
  2. Click Reinstall All at the top.
  3. Wait for the process to finish, then start your server.

While the server is starting, you should see mods downloading in the Web Console, confirming they are installed correctly.