Since Cataclysm, Blizzard made the client capable of streaming content in-game, so I managed to find a MoP Direct Downloader client:
[url="http://forum.warmane.com/showthread.php?262395-MoP-Mists-of-Pandaria-5-4-2-Installer-%2812MB%29-5min-installation"><s>http://forum.warmane.com/showthread.php ... stallation">http://forum.warmane.com/showthread.php?262395-MoP-Mists-of-Pandaria-5-4-2-Installer-(12MB)-5min-installation[/url]
I have not tried it though, but I remember using something similar when I played on Molten in Cataclysm, so it should work.
[url="http://forum.warmane.com/showthread.php?262395-MoP-Mists-of-Pandaria-5-4-2-Installer-%2812MB%29-5min-installation"><s>http://forum.warmane.com/showthread.php ... stallation">http://forum.warmane.com/showthread.php?262395-MoP-Mists-of-Pandaria-5-4-2-Installer-(12MB)-5min-installation[/url]
I have not tried it though, but I remember using something similar when I played on Molten in Cataclysm, so it should work.