Follow this link: http://stardict.sourceforge.net/Documentation.php
On that page you will see a link to the installation manual. That link takes you to another page that will tell you to download the file. Click the link, and it will ask you to either save the file (it's just another web page), or open the file. At first, I downloaded it, but the pictures didn't download, so I went back and just opened it, and everything looked okay.
There are directions for other OSes as well, but the Linux instructions are there.
Hope this helps.