Pre-saved worlds are downloaded from the AppData\Roaming\SpaceEngineersDedicated\Saves folder in your home directory (eg C:\Users\John.Doe) or from the ProgramData\SpaceEngineersDedicated'' folder on the root system.
To be able to play a local world that you previously created and saved on a dedicated server, copy it from the game save directory AppData\Roaming\SpaceEngineers\Saves to the corresponding folder on the Godlike server
Error installing mods
If you get this "k_EResultFail" error when installing mods
So you most likely need to update libraries on the server. You can find them in the regular Steam client on your computer in the folder C:\Program Files (x86)\Steam and add it to the server in the folder DedicatedServer64