It should be listed as Lightroom CC (2015) as an install in your Creative Cloud desktop app. If not, then read this:
Why am I not seeing the Lightroom CC upgrade/download in the Creative Cloud application? Lightroom CC won’t be shown in the Creative Cloud desktop application if your system doesn’t meet the minimum system requirements. It’s likely you are on a system with Mac OS 10.7 or earlier, or a 32-bit version of Windows 7 or 8. If you system meets the minimum requirements, try signing out and back into the Creative Cloud application and see if the Apps panel updates.