I had the issue that many of you are having now. The patcher will get to 99% and will be stuck at the VObank file.
What I did was follow the directions for a force repatch in the players support area of the site: https://support.leagueoflegends.com/entries/21804747-patcher-problems
I used method 1. I also opened LoL as an administrator.
I hope this helps.
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