When you purchased the software did you choose the download option? If so then please see the directions listed athttp://forums.adobe.com/thread/1006208?tstart=0&promoid=KBHJQ to download your software.
If you are unable to locate your installation media then please follow the steps at http://prodesigntools.com/direct-download-links-for-lightroom-3-and-ph otoshop-elements-8.html to download the software. Please make sure to review the Very Important Instructions section and complete them prior to scrolling to the bottom of the page and clicking on the download link.
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