I am experiencing the same issues as the previous posters of this blog.  I also would like a copy of the C# code that is referenced, but I am also unable to download it.  Right clicking the attachment ( ModalPopUP_C#_Code.zip) and selecting Save As only saves a web page (forum.html) and not a zip file containing C# code.   Could you provide me with a place where I can download this C# package? 
Thanks in advance!