Patch 4.19 Scanning Files

So i went on League yesterday to play. Instead of having a launch button, it was just stuck at 33% scanning files. As this has happened to me several times, I just let it run overnight. Today, I went back on to see if it fixed itself; it was still scanning files. I decided to repair my client (this solution has worked for me a couple of times), and now the repairing is just stuck scanning files (currently 27k files scanned, 5 hours in). Anyone have a fix for this?

P.S. Riot FIX YOUR FUCKING CLIENT. This has happened to me over 15 goddamn times in the past few months ONLY, and I am fucking sick of it. Sometimes when a new patch comes out, sometimes out of the blue. This is getting fucking ridiculous. I'm thinking of quitting League JUST because of this ONE ISSUE, since whats the point if I can't even fucking play? It really pisses me off.

New P.S. (?) It finished. Ended up having to wait way longer than I should have to. Seriously, this is incredibly annoying, and I hope that Riot can fix this in the next patch. inb4 it fixes in 2017