I have a creative cloud account, but before purchasing, I was using a trial version of lightroom. I now have the created cloud account, and the trial has expired, but I'm not able to activate the developing tool because it's telling me to purchase lightroom.
It will be necessary for you to uninstall the trial version that you have been using. Then you will be able to install Lightroom through the creative cloud application manager. You will be able to open and use the same catalog you have been using.