Installation Error: File does not exist (LOL.OC1.msi.)

Hi league of legends community, Im in need of great help. Recently, i've bought myself a new PC, once ive downloaded league of legends and try to install the game, an error showed up saying: File does not exist: C:\\Users\user\AppData\Roaming\RiotGames\League of Legends 4.1.2\install\LOL.OC1.msi. Had anyone experience this issue before and got a solution? Much help will be greatly appreciated. Regards, Cheunge
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