Strange!? The download links seem to be hosted at
http://download?.avast.com//files/skins/ (where ? is a number)
http://www.iavs.net/files/skins/
http://files.avast.com/files/skins/
To open a new browser and display odd things the links must be other than the *.aswcs files above. Seems to be an issue of your browser configurations…
Do you use any download manager?