The Way the Demonstration System is Installed has Changed
Previously a new version of the demonstration system was automatically installed every time you upgraded your Framework. This no longer happens in order to make sure you do not lose any changes you may have made to the demonstration system.
It is, however, recommended you install the latest version of the demonstration system so that you can see how new features work and to ensure there are no incompatibilities between the shipped components and older versions of the demonstration system.