As title says, the launcher doesnt download the patch and shows this(the screnie isnt mybe its from a reddit thread from someone with exact same problem). https://i.imgur.com/KJWa4L8.png
Update, the thread on reddit about it found a solution, posting it here for anyone that has some problem: Click the cog icon and the save button.It should fix the launcher.(worked for me)
To all of those that got the maintenance down screen and can't get in, go into your search bar bottom left for Windows 10 type in " %appdata%" click on appdata in the directory bar up the top of your file explorer and double click Local. In here you will see the folder for Black desert Online. Delete that folder then launch your launcher. Happy Grinding =)
One of our guildmember has same problem... Login - select server - disconnect. After using this method all charakter where gone and its look like a fresh account :x so we where glad that we have a copy of that folder... Now we need to wait for an other sulution guess