I have the same problem and i have already tried what it says to do in the common problems and solutions page. I disabled AVG and the Firewall, re-downloaded technic and it wont update and now i cant play at all.
Operating system: windows 7 (samsung laptop like smiley)
Java: the one that the launcher download told me to get
Anti Virus: AVG
Error Message: None. (but it does say download failed in the progress bar.)