New patch won't open, 'we have restored this installation to an older version of LOLs. now we'll try

So I am using a Mac OSX, when I opened League of legends today, there was a pop up window on login page said "we have restored this installation to an older version of league of legends. Now we'll try to patch it up to the lasted version". After I clicking the "okay"button, it started to update, something 86.9 MB. After that the window just disappeard and nothing happened. The little icon in Dock's also disappeared. If I reopen the application it goes back to "we have restored this installation to an older version..." Anyone have the same issues? Please help...
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