You need to modify the host file for unmanged cients. For unmanged clients you can tell them to get it from Live update Administrator.. You need to make a host file for them..
To generate a host file, on the Configure tab, click Client Settings, and then
select the Distribution Center that you want your LiveUpdate clients to use.
Click Export Window Settings to export the Settings.Host.LiveUpdate file, or
click Export Java Settings to create the Java LiveUpdate client file.
You then copy the file to the \Program Files\Symantec\LiveUpdate directory
on the LiveUpdate client computers. When the LiveUpdate client runs, it will
use the host file for information on where to download updates.
For information on how to perform management tasks, see the
LiveUpdate Administrator User's Guide