Hello ! I'm Aymeric, an independent advisor, and I'm here to help !
Open your Task Manager (you can do so by using the Ctrl+Shift+Esc keyboard shortcut) and make sure all League of Legends-related apps are correctly closed. If one app is remaining, you will not be able to correctly delete the remaining files.
Also, if you want to proceed with a clean uninstall, your best bet is to directly use the Settings to uninstall the app.
Feel free to ask if you have any other question !
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