I can get through the first three steps but on Step 4 it tells me to "Open the config-demo.json file in the stemapp/sample-configs folder. Find widgetPool->widgets, and add a new widget element like this. Save the file."
These files don't exist in my download, I don't have any file named config-demo.json, and I don't have a sample-configs demo folder.
Am I looking at the wrong thing or am I supposed to create these folders?