Just checking in to let you know that I'm working on this, but I'm having a lot of trouble getting it to work. I can't find an installer for the most recent Forkage, so I went to compile it myself. I needed to install ant, because the provided version from github wasn't working. I screwed around with system variables for a while, then ant worked. I went to compile Forkage into an installer, and it crashed while downloading some resources. I'm downgrading to Java 1.6 to see if that does anything, but I'm at wits end here, I just want to play some MineCraft.
EDIT: if someone could provide an installer jar for an updated version of Forkage, I would be eternally grateful, as the forums for Forkage seem to be down