I've tried the installation of Lightroom CC, as I've done on many other CC apps, via the Creative Cloud utility. I've installed and uninstalled twice but Lightroom CC doesn't open. Not even sure if the icon is correct as I don't see the Lightroom CC anywhere, even though the installation completed twice without error.
Is there an Lightroom CC executable or is it just lightroom.exe?
Have you tried logging out of your CC desktop app, then logging back in again? Quit/Restart won't work, but logging out and back in should. See here: https://helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html