How can I update my LR6.2.1 on Mac OS-X 10.11.1 to LR 6.3?

I'm running LR 6.2.1 and when I choose Help/Updates, the AppManager tells me, that my LR ist up to date. Nothing about LR 6.3

In my Office, I updated today 13 Macs without any problem. What's going wrong?

cu

Toni