Can't update my client

I played a game then decided to relog, it told me that the client needs to update and it has to restart.

I clicked "Restart now" and now it say 0.0/0.0 mb and it's stuck there. Nothing happens. I tried to exit and log back in thinking it's stuck but it still requires me to restart client for this update.

My client is already updated on the 7.23 patch.

What's going on ?