LoLReplay not working?

So I went back to the LoLReplay site because I was hoping they'd fixed it since the last time I tried to use it and it didn't work. There were update notes saying it was fixed for 5.3.X so I downloaded it, but when I tried to view my game it said it was recorded in an older format and wouldn't load the game.

Anybody know of any fixes for this? I've been really wishing I could go back and watch some of the plays I've been seeing people do and some I make myself, they're tons of fun to see more than once and I'm super bummed it isn't working for me. :(