Patch 4.20 and can't connect to a game

I updated League of Legends to 4.20 and when I tried to connect to a game, it crashed. When I restarted my client, it said the installation wasn't done correctly, so I tried to update my game and it still didn't let me connect to the match. It counted as a leave and i couldn't do anything about it. Rito why you do dis to me ;_;