cant downlaod riot client

hey, i starded playing league for the first time in a wile now. only after a couple of games league of legends told me to reinstall because of some issue. so i tried that. the problem is that the riot client wond install. whenever i try, i get told that a repair is needed because some files in the installation corrupted or missing. Does anyone know what the problem might be ? i use firefox as a browser and i use windows 7 so could that me te problem ?
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