Can't Log on LOL. Patching problem!

I can't log on to league it keeps saying ''We have restored this installation to an older version of League Of Legends. Now we'll try to patch it up to the latest version. But when I click on Okay it says ''There was a problem patching League Of Legends. We'll restore a backup version and try updating again after you restart the patcher.'' file:///Users/miseonbag/Desktop/Screen%20Shot%202017-08-12%20at%201.29.14%20PM.png