For those who bought the Birthright and Conquest routes, do you get the chance to download the opposite route once you reach the split?
Yes, you can. It looks kind of stupid when you get to that point, but it's clear enough. It has the art for the game you own show up on the bottom screen while you hover over that option, but if you hover over the opposite option it's just an ad for that game. It really breaks immersion. I actually got the other from GameStop as a download code, but it didn't let me input it until after the split (for god knows what reason), so that's the only way I know.
Random edit: I just started Conquest, and I'm on Hard/Classic Chapter 7, with a backup save at the split in case letting Camilla die there made a difference. If it did, I can redo that level.
Random other edit: I just noticed this and I'm dumping it here for any wackos trying out Lunatic/Classic in Conquest, but only you gain experience in Chapter 6. So don't feed kills to anybody except yourself.