

Right click (or command click) on the Ravenfield application and a press show package contents.Start Ravenfield (if you want to remove the mod delete Assembly-CSharp.dll from Managed and rename Assembly-CSharp-normal.dll or whatever you named it back to normal).Copy and paste the modded Assembly-CSharp.dll (make sure it is named that) and place it in the Managed folder.Rename Assembly-CSharp.dll to another name like Assembly-CSharp-normal.dll.

Go to open ravenfield_Data and then open Managed.Click Browse Local Files, you should now see the Ravenfield files.Find the Local Files tab and click on it.Right click on Ravenfield and hit properties.Navigate to your steam library and find Ravenfield.They are made by the Ravenfield Community, and can be used by anyone.
