So I just spent 3 painful hours trying to get the controllers to show up in the latest SteamVR. When you hit run they disable themselves. I have no idea why. Also it throws these errors:
Request error (error):
UnityEditor.AsyncHTTPClient:smile:one(State, Int32)
Failed to load IVRRenderModels interface version IVRRenderModels_005
UnityEngine.Debug:LogError(Object)
RenderModelInterfaceHolder:get_instance()
(at Assets/SteamVR/Scripts/SteamVR_RenderModel.cs:90)
SteamVR_RenderModelEditor:LoadRenderModelNames()
(at Assets/SteamVR/Editor/SteamVR_RenderModelEditor.cs:57)
SteamVR_RenderModelEditor:OnEnable() (at Assets/SteamVR/Editor/SteamVR_RenderModelEditor.cs:33)
If anybody know why, Please let me know. It’s my first night of working with VR in Unity and I seemed to have started with a minefield. 
Looks like the steamvr plugin you’re using is missing its assets? maybe try re-installing the plugin (or seeing if the files exist)
That’s what it seems like but there are meshes. I tried the copy on Github also. It seems to match what I have downloaded from the asset store. It just turns off the controllers when you hit run. I know it senses them because I see the barriers when I reach around.
Just ran the version on Github and got these errors:
SteamVR_GameView is deprecated in Unity 5.4 - REMOVING
UnityEngine.Debug:Log(Object)
SteamVR_GameView:Awake() (at Assets/SteamVR/Scripts/SteamVR_GameView.cs:14)
UnityEditorInternal.InternalEditorUtility:HierarchyWindowDrag(HierarchyProperty, Boolean, HierarchyDropMode)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
Not Initialized (109)
UnityEngine.Debug:Log(Object)
SteamVR:ReportError(EVRInitError) (at Assets/SteamVR/Scripts/SteamVR.cs:116)
SteamVR:CreateInstance()
(at Assets/SteamVR/Scripts/SteamVR.cs:80)
SteamVR:get_instance() (at Assets/SteamVR/Scripts/SteamVR.cs:48)
SteamVR_Render:OnEnable()
(at Assets/SteamVR/Scripts/SteamVR_Render.cs:287)
UnityEngine.GameObject:AddComponent()
SteamVR_Render:get_instance()
(at Assets/SteamVR/Scripts/SteamVR_Render.cs:33)
SteamVR_TrackedObject:OnEnable() (at Assets/SteamVR/Scripts/SteamVR_TrackedObject.cs:82)