Hollowed0ut

Sorry if I posted this in the wrong spot, new to this forum c:

So, I was on my computer, and I got the sudden urge to play some tekkit or Voltz. Now, I tried this about 2? weeks ago and it worked fine. But now, after I log in and try either tekkit or voltz, it will start updating then says "update failed". I tried this several times with several different builds and none of them worked whatsoever. I also tried to delete the whole .techniclauncher and that didn't work either. Please help me!