I'm probably not the first not the last person to watch the stream in a second screen and play the game in another, but that's the only way that I'm able to enjoy both things at the same time!
Install the Black Desert Launcher if the game doesn't start.
The launcher will appear if it's installed.
If it doesn't, try to run your downloaded launcher.
1 Run BlackDesert_Installer_NAEU.exe to install the Black Desert launcher.
2 Start the game once installation is complete.
I'm probably not the first not the last person to watch the stream in a second screen and play the game in another, but that's the only way that I'm able to enjoy both things at the same time!