launcher pad ""MESSED UP""

hey ppl. when i open the game it was donloading a new patch then when it was in somewhere in 75 or 79% it said error. then after that i try opening it again but the launcher pad did not show the half of it. i try donloading the game again but did not work, my launcher is still messed up. i cant start the game and i want too play the new maps.. HOW DO I FIX MY LAUNCHER PAD PLZ hellpppp!