Unable to launch game. Launcher broken as well

CAS error has broken game entirely. Cannot reinstall game.
I have followed the guide, optimized my drives and still the Battle.net launcher will not allow me to reinstall the game. It follows up with the very same error message caused when it tried to update and failed. Again the same error message caused when it tried to repair the game and also failed to do so.
I had tried reinstalling the launcher, thinking it was a launcher issue. The same error had occurred before I uninstalled World of Warcraft. Now it won’t even let me install the game again.
All guides to uninstalling and reinstalling, as well as troubleshooting the errors come up with BLZBNTAGT00000BC9 error code. My internet connection is running smoothly, however.

A post was merged into an existing topic: Cant start the game / the cas system was unable