My software doesn't accept the serial number and I just bought it!
Please make sure you enter the serial number exactly as it appears in the confirmation email (with CAPITAL letters if needed, no spaces).
There are only 4 letters in each serial number; everything else is a number.
If copying and pasting the number into the registration dialog, try typing it in as sometimes a space can inadvertently be included in a copy/paste. Contact Mariner Software if this doesn't work.