We’ve actually dropped the key file concept for version 2 for now, because of it’s limited use. It’s not a bad thing, just not worth the trouble for most users.
In the the future we’re likely to accept various kinds of tokens that can carry a secret key such as Yubikey and possibly smartphones. We might consider USB drives, i.e. key files also but for now we don’t support this.
Yes, you can still download version 1. Go to http://www.axantum.com/ and chose downloads.