Step one: Download the Official Downloader.

Step Two: Download the game client with the official downloader.

1. Double click on the downloader.

2. Save the target file (the game client) to default directory.

  Downloader interface:

  From the interface you could see the progress and other relevant figures.

Step three: install client.

  Once the download is completed, you will be asked to setup the game client, just follow the instructions and it will be done!