im useing .RAR i called it "RedstoneFactory.zip" its located at C:\Users\***********\AppData\Roaming\.technic\modpacks\redstonefactory
the only thing in the bin is called "modpack.jar"
i made a mod pack and it wont work all it says is
"Error unzipping a file for the following pack:RedstoneFactory
error in opening .zip file
please consult the modpack author"
please help me if you can