Hi Jan ,
If you're a paying Creative Cloud member, you may not see Lightroom in the Creative Cloud if your computer doesn't meet the minimum system requirements. Check to make sure that your system meets thehttp://helpx.adobe.com/lightroom/kb/system-requirements-lightroom.htmlminimum requirements for the latest release of Lightroom http://helpx.adobe.com/lightroom/kb/system-requirements-lightroom.html
If your system meets the minimum system requirements and still you are unable to see the LR app then you can download LR from https://www.adobe.com/cfusion/tdrc/index.cfm?product=photoshop_lightroom
And then use your Adobe ID to license the software.