Download the DNAMAN Installer file below.

This file is in compressed format.  After downloading, your browser
will extract DNAMAN installation file automatically. If not, you may 
click the downloaded file to decompress.

Click the DNAMAN installer file on Desktop and follow the package
installation instructions.

At the end of installation, DNAMAN will ask for username and serial number. 
Do not enter any information as you are using demo verion. Check the
option of "Setup as Demo" and compete the installation.