Download the zip file (LDoms_Manager-1_3.zip) from the Sun Software Download site.
You can find the software at http://www.sun.com/servers/coolthreads/ldoms/get.jsp.
Unzip the zip file.
$ unzip LDoms_Manager-1_3.zip |
See Location of LDoms 1.3 Software in Logical Domains 1.3 Release Notes for details about the structure of the file and what it includes.