League of Legends and Windows reinstall

Greetings, Due to some performance issues that I've been having lately, I've decided that I wish to reinstall my Windows. The question I have is, is it possible to run League of Legends without having to download the whole game once more. It's installed on a separate partition and won't be affected by me wiping my main partition. I've already performed Windows reinstall a couple of times, but I've never been able to run League without completely reinstalling it (bothersome) so I wanted to ask if anyone has any information on this matter? Thank you
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