Game Patches 1.5 Gb On Every Launch

Hello Reader!

I've been running into an issue of late with what I would assume is with the LoL patcher. Every single time that I launch Lol via my desktop shortcut (or any method for that matter) the game insists that it's out of date. I have not played in several months, before this issue arose, my login screen (or art) was/is the Pulsefire Caitlyn login. The game then comes up with its error message {paraphrasing} "This version is out of date, update it." This is annoying since every launch costs me both time and I have a limited Internet usage. I was logged in with the current starguardian Ezreal art and even played a match earlier today. I have since closed the game twice and I still get this issue. At first I was okay with an update, just thinking it was sheer coincidence that it was a global update; I was mistaken. As you could probably imagine, this is extremely frustrating and has put me off from returning to league. #firstworldproblems Does anyone have any suggestions?

TLDR; My game seems to think that it needs to patch EVERYTIME I launch it, despite having downloaded the previous/same patch several times. LoL replaces the old version on each launch costing me 1.5 Gb of internet usage and 10ish minutes of my (and my friends) time.