If you have Java installed properly, just double-click the jar file and it will run.
If it does not work, open a command prompt and type:
java -jar SmartXAutofill_Nov03Demo.jar
You can download the tutorial on how to use the demo
here (zip file, 1.49MB). The zip file generates a folder with
lots of html files. You can start the tutorial by opening index_frame.html.
You can also access the tutorial in the demo, just go to the Help Menu -> Index.