League does not download!!!

Hey Guys, I haven't played league in a while because my computer needed a reset (Mac High Sierra). Now I wanted to reinstall League and I think this is the 10th time I've tried to download it. Everytime the pop-up (updating) comes up it disappears again and I need to click on League again but it keeps shutting down. And when I finally get to log in, the game starts downloading and it just shut down again. I've tried to uninstall league of my Mac and reinstall it but the same problem keeps showing up. I've been trying for 2 days now and it's getting on my nerves. Can somebody help me? Or tell me what I'm doing wrong?
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