I'v been trying to get forge to install for a few days, iv tried 1.7 and 1.8 latest and recommended builds. I keep getting a super long error window (long enough that it extends to my second monitor)
Link to screen cap: http://41.media.tumblr.com/daba67e8ff659788e1e22b980f43a393/tumblr_nkjwkd5yjI1rq8tilo1_1280.png
It looks like the intaller is just un-able to download the files it needs. my fire wall was off when i tried to install so that's no it.