League of Legends installer doesnt want to open

I had a problem with a running League client so i decided to reinstall it. Now, when I went to the official League of Legends site, clicked on "Download the game" on EUNE server and download it i cant open installer. I clicked on downloaded setup 1000 times and after that clicked on RUN but installation doesnt want to start. Nothing, but literally nothing is happening. What should i do?
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