Sorry for the reply delayed due to the weekend.
Please check whether you are using the latest version of Sothink SWF to Video Converter 2.2 build 70618 on your computer.
If it is, please check whether you have imputted a blank in the registration name and key of the registration panel.
If it does not solve your problem, please send a screenshot of the version on your computer, and also the registration name and key you imutted in the program to firstname.lastname@example.org
for us to have a check.
Hope that helps and have a nice day.