If the passcode contains zeros "0" or the letter "O". Please try switching around the 0 with an O and vice versa. Else if the passcode contains the letter "I" please try using an capital i instead of a lowercase L.
Your original passcode only works once. When you login here in the download area for the first time, you are sent an email from "email@example.com" which contains your ilok code and permanent login information.
You can login to your new Slate user account here: http://users.drumclassroom.net/
Also, please add these 3 email addresses to your address book or to your "allowed emails" section in your email account:
This will prevent our email confirmations, updates, and newsletters from being sent to your spam and trash folders.