When you run it again your client will get updated automatically and then continue to run the demo.
The source and resources files of the demo in its latest version are also available for download in the same place as before. That is under the Help pulldown menu.
The download screen keeps the link to the V1.8 version of the source files in case you wish to continue and use the previous release of uniPaaS V1.8.
Enjoy :-)
