It seems that a lot of people have to sign out of the creative cloud desktop manager and then sign back in before they can install Lightroom CC.
HI Jim, thanks for responding.
I did sigh out and back in. No difference.
In the app it says up-to-date and lightroom CC 2015.
When I start up LR it says the version is 5..
If Lightroom CC 2015 is shown as up-to-date then it is installed on your computer. The icon for the new Lightroom is the same one as for Lightroom 5. So you are starting Lightroom 5 from the icon. Installing Lightroom CC will not replace Lightroom 5. If you cannot find the icon for Lightroom CC then go to your programs folder and create a shortcut for the new version.
Slightly confusing that the old version is still there and has the same logo.
i indeed clicked the LR logo belonging to the old version.