Your original passcode only works once. When you login here in the download area for the first time, you are sent an email from "firstname.lastname@example.org" which contains your iLok code and permanent login information.
Please check your spam/trash folders to make sure it wasn't sent there.
Also, please add these 3 email addresses to your address book or to your "allowed emails" section in your email account:
This way, our email confirmations, updates, and newsletters will not be sent to your spam/trash folders or be blocked completely.