What happens when you log out of your account and then log back in?
Had the same issue. First shut down Creative Cloud. Next navigate to the folder
where <your user> is your user name. Delete the opm.db database file and restart the system. When you log in to creative cloud, it will index what you have and dont have installed and you should be able to reinstall it.
Have you done the control panel - uninstall first for PP CC?