Southcraft

Hi there minecraft forge creators ! I have a problem installing minecraftforge for my minecraft 1.6.4. When I do the click on the .jar (the installer),it's open a mini window in black and something like : ''the principal archive wasn't found'' or something like that. And I do other click and the same.I download the latest forge and nothing. I have a pirate minecraft launcher in my Windows 8 . I have forge until minecraft 1.4.6 , I need it now Bye !!! I will post an image (i am argentinian it's in spanish ).