I know it's been a while, but once again i have a problem (again, my bad) i updated the launcher, and there seems to be a problem after it comes up to the FML is loading window and then suddenly gives me this Halp.
You need to re-download the launcher from http://skcraft.com/welcome since it was updated to allow incremental updates a few weeks ago.
Have you tried to completely delete the folder .skcraftalice in %appdata%? That may or may not fix it.
Library\Application Support\Library\skcraftalice to put it properly. Just because mainly macs are unable to open any directory starting with a (.)
It's not that they can't. It's just that files and directories that start with a period are reserved for critical, system, or hidden files in OS's with *nix roots.