[CLIENT] League client isn't updating (11/25/17)

Hey, I'm trying to update my league of legends client, but after a few seconds all it says is, "Patching failed and we don't know why, Please restart the client to try to start patching again (Error 004)" I've tried but I'm not sure what to do now.

Edit: There's also a notification on my desktop that says "LeagueClient.Exe has been corrupted." Notifcation if you're wondering what it says: https://gyazo.com/c735a1b0eabe0795eb7aea3b1ff3bdd0