A Q in the serial number was too low to the label and looked like an O. I'm all set now. Thanks.

I just received my box of Earmaster 5 from Amazon.

I found the EarMaster Serial # on the manual cover.
I registered my name and serial number on your site.

I've tried entering the serial # several times and made sure I'm entering everything as it's printed (i.e. letter O correctly, not 0 zero ...