1. Make sure World of Warcraft and/or the launcher and background downloader are completely closed. 2. Open up your World of Warcraft folder. 3. Open your WTF folder. 4. Open Launcher.wtf in Notepad and change the "accountType" line from "LK" to "CT". 5. Open Config.wtf in Notepad and change the "accountType" line from "LK" to "CT". 6. Run the Launcher. I had one account only download 700mb, and I had another one download 5gb. Both were logged in today. Weird.