Ok, I've got it.
You've used "open site", not "open solution". This will not work because you need to build solution to run this demo.
Here is how to run it:
1) Open solution Aspose.Editor.Demo.Web.2005.sln, you'll see two projects in it,
2) Open source file Application.cs, go to line 90 and comment it, remove reference onto KeyotiSpellAdapter (see below why you need this),
3) Rebuild Aspose.Editor.Application.2005 project,
4) Rebuild Aspose.Editor.Demo.Web.2005 project,
5) Configure security policy to trust your VS 2005 Web Server (see how security_script.aspx does this). Don't forget to include port number into the URL, e.g. http://localhost:2925/*.
6) Now run Aspose.Editor.Demo.Web.2005 project,
In this way you'll see Aspose.Editor running but spell checking functionality will not be available. In order to add it you need to download latest Keyoti spell checker for .NET (www.keyoti.com) and rebuild KeyotiSpellAdapter project (C:\Program Files\Aspose\Aspose.Editor\Demos\KeyotiSpellAdapter). Then you can reference this adapter from the application project and uncomment line 90 in the Application.cs, rebuild application and site and run it with spell checking enabled.
If you have other questions please ask.
Kind regards,
Michael