I suggest, If you have an annual subscription and version CC2015, it is recommended you use the Creative Cloud App to update Lightroom.
Start the CC App (if it is not already running ).
Also you might sign-out and then sign-in to refresh the CC App. (Click the cog-wheel and then 'Preferences'.)
Then Click on the Apps tab.
If you have an old version the button next to Lightroom will show [Update]- Click this.
If you are using the latest version CC2015.7 then the button should show [Open].
If none of the above seems to work you can re-install the Creative Cloud App and try again.
Yay, that fixed it, thanks very much