League refuses to uninstall

I'm running low on disk space in my (C:) drive so I thought I'd uninstall League of Legends. Unfortunately, when I tried doing it from the settings application (Windows 10), nothing happened. I went to the control panel to uninstall it, but still, nothing happened. Any fixes? Also, while I'm here, is there any way to install LoL to the (D:) drive? I'd like to play it but I'm basically out of disc space on the (C:) drive.
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