I confirm, I have the same problem to update LR 6.2 .
I am located in France
Please check the below link that might help you:
This is nice, but why doesn't it work as it did always before. And why do the update appear in the CC App, if they do not work? This is quite strange. I do not want to start with work arounds to keep things running.
In fact for me it is a problem of password ... I do not understand because I can go on the Adobe page and I appear with my name and my picture...
I precise I am on Mac Pro with El Capitan
I never met this previously