New Victory/Defeat screens not appearing, EVEN AFTER Repair AND full reinstallation

I heard about the new Victory/Defeat screens from my friends, and when I searched them up, I found that I liked them. However, after a game, I noticed that I still had the old Victory/Defeat screen. After searching the problem up, I found that I had to Repair my client. However, after I used Repair, I found that I still had the old Victory/Defeat signs. After contacting the support team on Twitter, I was told to do a clean re-installation of my game. After I spent an hour reinstalling it, I was shocked to find that I still had the old screen. I contacted the Twitter support team again, but I did not get a response. I use the Mac version of the game.

(I was told to put this here after emailing Riot Support)