Hello Zell,
The Flow Chart Builder Demo from the Diagram ASP.NET examples required the Enterprise edition of the Diagram. This is because internally the example makes use of automatic layout in order to layout the shapes in library view. You can produce a similar example with the Professional edition, however the automatic layouts are part of the Diagram Ent. edition.
Nevron Diagram is licensed on a per developer basis (per developer seat) and production web server deployment. For web based applications, if you need to deploy your application using Nevron components to multiple servers, you will need to purchase additional web server licenses.
Best Regards,
Nevron Support Team