Just to assure you this user did receive his activation code the next day. The code is sent by Automated e-mail from the AviatorCalc web site. Sometimes these e-mails don't make it so we provide a support form that users can fill in a feedback form for this such as missing Activation codes. We then e-mail using a different source mail account such as hotmail.
More information on AviatorCalc flight planning can be found at
AviatorCalc Flight Planning
Bob Rathbone (Author of AviatorCalc)