For anyone else experiencing similar issues, here's a few things:
1) Don't Panic.
2) Make sure you're not using Impulse/Gamestop. We're using this now:
And soon we'll be using this:
3) It's possible there was a delay in processing your order. It's not common, but it happens. If nothing's showing up on the download page (link above), wait an hour or so to be sure, then email firstname.lastname@example.org and we'll take a look at things.