To fix your problem you have to run the launcher as Administrator. Only this way it can update the game. When you are ingame you have to register a account. You can host there your own server and play with bots or online player can join you if you dont put a password on the server.
The server that you will host will be running from one main server.
The servers are currently up aswell they are 24/7 online only the official ranked online game servers are running between this times:
Monday - Thursday : 7pm - 10pm
Friday : 7pm - 11pm
Saterday : 2pm - 11pm
Sunday : 2pm - 10pm
You can also ofcourse make your own server.
Hopefully we helped you out this way.