yeah I got the message...

"Due to overwhelming demand, our servers are running at maximum capacity.
Therefore, your OneKnob Louder free serial number has not yet been created.
Another email containing your OneKnob Louder free serial number will be sent to you within 48 hours. We apologize for this inconvenience."

Takes as much time/resources on the server to send me that message as to generate a serial and send it to me. However, all of their Black Friday marketing was present in the email!