RouteDebugger is not in namespace

In global.asax.cs, if I uncomment this, compiler complains RouteDebugger is not in namespace.

            //For debugging
            //RouteDebug.RouteDebugger.RewriteRoutesForTesting(RouteTable.Routes);

Looks like a new version is avail too
https://github.com/Haacked/RouteMagic

https://www.nopcommerce.com/boards/t/14279/the-type-or-namespace-name-routedebugger-does-not-exist-in-the-namespace-routedebug.aspx