Rakoun

I had downloaded technic a few years ago on my mac and it was working fine and then recently i tried opening it but all it does is it shows me the java logo in the dock and then it disappears and the comes back for a second and the closes and ive already tried deleting and downloading it again but it still isnt't opening . What can i do ?

I had downloaded technic a few years ago on my mac and it was working fine and then recently i tried opening it but all it does is it shows me the java logo in the dock and then it disappears and the comes back for a second and the closes and ive already tried deleting and downloading it again but it still isnt't opening