You have to call the Delrina Customer Service Line at 1-800-268-6082.
When the line answers you'll inevitably get a cryptic voice-mail message
telling you to leave a message. If you leave a message you may never
hear from them again, so just press '0' to reach an operator and ask for
Suzette in Customer Service; she'll take your address and mail you the
disks.
Disclaimer: I have no relationship to Delrina other than as a
[disgruntled] customer.