The Creative Cloud does not utilize serial numbers. When you subscribe you will get an access code that you use to set up the desktop manager and that should be the only place you need to provide some form of access code. After that you download/install programs thru the manager.
http://helpx.adobe.com/creative-cloud/help/install-apps.html to install or uninstall
Cloud Getting Started https://helpx.adobe.com/creative-cloud.html
-Install, update or UNinstall, and launch after installing