Same here, but,
Have you read the log file "WoWsLauncher.log" located in your new launcher folder?
Mine sais this:
14/10/2018 13:43:26 ERROR: http request failed. what: http request error, msg: Unexpected http server response code(503).
14/10/2018 13:43:26 ERROR: <html>
<head><title>503 Service Temporarily Unavailable</title></head>
<body bgcolor="white">
<center><h1>503 Service Temporarily Unavailable</h1></center>
<hr><center>nginx</center>
</body>
</html>