That'd require me to use a shorthand form to answer questions, which is against my religion you see. You seem reasonable enough to be patient enough to read more than a shorthanded format. And anyways, every damn format for every damn mod/game/anything troubleshooting report is the same. It's just obvious questions that can be answered in a single sentence as thus: I have the latest version of the launcher, latest Java, latest errything, Windows 7, no antivirus as of now until I reinstall Avast, and the error just says download failed. It's inconsistent. It doesn't fail at the same point every time, or not work altogether. There's no error whatsoever, I've checked the logs; it just does nothing until I exit the launcher.
Say I try Yogbox. It goes along like this. Same for Technic, Tekkit, Voxel, and Hack\Mine
[18:32:14] [sEVERE] Starting download of 'http://mirror.technicpack.net/Technic/mods/mocreatures/mocreatures-v3.3.0.zip', with 3 trie(s) remaining
[18:55:02] [sEVERE] Exiting the Technic Launcher
Also, the changing of the avatars and titlemajigger is quite rude and childish.