Context Capture Viewer availability

I have to give a lecture from someone else's computer and wish to demonstrate a CC model that I can copy across from my computer.  I believe that Context Capture Viewer is freely available but if I try to download it I get a file that Microsoft will not execute.

The web site implies that the viewer is freely available - is that the case, and how do I instal it (ideall on an external hard disk so I don't leave a copy on he other cmputer).