My launcher has also downloaded last 30GB + patch multiple times.
It happened to me 4-5x times over roughly 50 launch of the games. Totally random.
Half the time I got the server mismatch thing, and I just logged out and back in. Didn't need to do the "french version hack" thing to get it to work.
But yeah this is annoying as hell. I played all day today, logged in and out a few times, and now logging back in for a scheduled OPS surprise surpise it's patch time again...