go to adobe.com and register yourself.once done,go to the bottom of the page where it says lightroom and click the try tab.once you are redirected,inject these codes into the url and download.you need both parts in order to get the program to install and work.

http://trials.adobe.com/Applications...HSPCS4_LS1.exe
http://trials.adobe.com/Applications...PHSPCS4_LS1.7z