Using the latest version of Unity (3.0.0-beta.5), I had to change 'UnityEngine.Experimental.Rendering.HDPipeline' to 'UnityEngine.Rendering.HighDefinition' in Line 7 of Assets\dstools\EditorScripts\DarkSoulsTools.cs to get the DSTools window to work.
Using the latest version of Unity (3.0.0-beta.5), I had to change 'UnityEngine.Experimental.Rendering.HDPipeline' to 'UnityEngine.Rendering.HighDefinition' in Line 7 of Assets\dstools\EditorScripts\DarkSoulsTools.cs to get the DSTools window to work.