Been using 5.7 for some time until my recent purchase of a 5D MK 4 and experiencing inabilty to open raw files. So I bought a copy of LR6 after reading I need 6.7 to import Raw from new 5D4..after a couple of hours I finally installed it. The process kept bringing me to CC, and having to sign in, and out until I finally was able to enter a serial number.
Now it seems I'm locked into CC with stand alone LR6. I can't even begin to tell you how I accomplished the installation.
How do I update to 6.7?