An exception was thrown during layouting

Aug 3 at 2:23 PM
Hi, I'm trying to get the GraphViz WPF Demo up and running to see if this tool is viable for an upcoming project. However when trying to run the demo I get the following error where the graph should be visible:

"Graphviz4Net: an exception was thrown during laying.Exception message: The system cannot fnd the file specified".

As per http://netdevelopdebug.blogspot.ie/2015/05/graphviz4net-system-cannot-find-file.html I installed graphviz from here http://graphviz.org/Download..php

Is there something else that I'm missing with the setup?
Aug 16 at 1:49 PM
I get the same error, even when I explicity set the DotExecutablePath property