KMagnifier comes with most of the modern linux distributions. Please refer to your distribution CDs to see if KMagnifier is available. Here I will mention the distributions which carry KMagnifier for sure:
Linux Mandrake (starting with version 8.1) : To install, (1) Open the software manager and search for kmag. Select the RPM that the software manager found and click on install or (2) As root, type urpmi kmag and KMagnifier will be installed.
You can always access the latest version of KMagnifier in both source and binary (executable) form at the KMagnifier website: http://kmag.sf.net.