Do I need to uninstall the stand alone copy of Lightroom 6 before enacting the free trial of CC? I started the free trial and it downloaded PS and appeared to download and update Lightroom but I can not tell if it is Lightroom CC.
Moving to the correct forum.
No you don't need to uninstall LR 6.
To tell what version you have opened, go to Help->System Info, it will tell you the exact version number of the Lightrooom you are using