Not able to start Warmane Client

Like the topic reads, I'm unable to start the Warmane client since today. I started it like usual the first time, then I logged in like I usually do. After the log-in, it started updating with this Blizzard Launcher thing. Then it kept going and started battle.net with my retail account, after which it started updating the retail WoW. Anyone knows how I can fix this?

1. Log in with username not email.
2. Make sure battle.net launcher does not detect and update Warmane client. If you have retail client also it should not happen. If not, you have to check battle.net launcher settings.