Can't play this game anymore because of the new client

The Error 004 appears, doesn't matter if hotspot shield turned on or off inside the client. It won't upload updates or ANYTHING at all. That error alwas appeared and i alread used Hextech repair for nothing. It always says restart the client you have a problem blah blah when i hover over the play button which is grey instead yellow. I can't even press the damn play button riot, i can't play your damn game anymore
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