Copy and paste this url

http://www.caminova.net/en/downloads/download.aspx?id=1

Ver. 6.1.4 MSI – Windows XP SP3 / Vista / 7 / /2003 R2 /  2008 / 2008 R2 / (32/64 bit)

NOTE: DjVu Viewer does not support 64-bit browsers
You will have to run the 32 bit version of your browser when running this version.
They are working on a 64 bit version.