TBGS_Destroyer

i tried downloading 8u51 but im not sure if i got the right download can you help me out?

So i got Technic and i thought it would be cool yea alot of modpacks and stuff ... so i downloaded pixelmon so i can play with a friend and i clicked play it loaded then it closed the launcher and re-opened the launcher saying nothing and i tried this for several modpacks its the same for all of them my java is up tp date 64-bit and i dont know why anything isnt loading??