Client crash into update required.
I was just doing a 5v5 normal draft with a full team and my league client froze after clicking "Lock in". We thought alright, this is a thing that happens, and I didn't actually close the program, leaving it up in its frozen state, until the match started, so we wouldn't need to wait 5 minutes for "Abandoning". Once my friends got into the load screen, I booted league back up, as normal and .admin, and it says I need a 1600MB user interface update. I tried restarting through both launchers and neither changed anything.
In addition to the bug report, I'm wondering if the abandon auto report/any reports the enemy team might make could be forgiven, and possibly the loss, I imagine they will lose, as there's nothing I know of that I could have done to prevent this.