I upgraded from Lightroom 4.3 to Lightroom 6 (via a software download from Amazon) a few months ago. Somewhere in that process apparently I also signed up for a free trial of Creative Cloud. Now I cannot open Lightroom 6 unless Creative Cloud is running. And sometimes CC will not open (just keeps trying to load) or it asks me to do an update. Can't I just dump CC and run LR6 without it? Every time I want to upload some images from my camera I have to go through this huge hassle or just use LR 4.3 which loads fine.
I would suggest you may uninstall Creative Cloud, and also if you open Lightroom and check the version of it, and it says Lr CC 2015.1
I will suggest you to uninstall Lightroom as well and then reinstall it from the following link : https://helpx.adobe.com/lightroom/kb/lightroom-downloads.html