Game won't launch on Mac

I for some reason have two League of Legends applications. League of Legends takes up 6.43GB and League of Legends2 takes up 5.6GB The first one will just "bounce" once when I click on it. The second one will open up the client before the login screen. It will say it needs to update and say Step 1/2: Updating Interface | 1638MB (913KBs). After 5 minutes it will say there was an error and close out. What should I do?
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