We're aware of an issue where players are receiving a "Failure to Read Launcher Version" error after today's (12/14) patch.
We've had reports that this error can be temporarily resolved by swapping the region settings on the launcher and then back. (ie: NA -> EU then set it back to NA).
If that doesn't work, please try the following:
Navigate to this folder:
You can simply click on the address bar in Windows Explorer and copy paste the above line.
Then delete the BlackDesertOnline folder and restart the launcher.