It hasn't been working for the past week and I really want help now.
Trust me, I've gone through a bunch of threads and nothing has worked. I've tried everything.
Please help me out.
Also, my friend has been having the same problem so I am double checking the website.
Edit 1/08/15: It started working once I reinstalled it a few times, now it is updating and working fine.

Any other details available? Have you tried grabbing the launcher off another player?