Good afternoon,
Could you please provide more information about the issue you're experiencing?
By the way, I’ve been developing plugins for over a year, so I don’t think it’s appropriate to use the term “amateur job” just because it didn’t work for you.
In the meantime, let me ask you:
1) Did you follow the steps in the video correctly?
2) Did you make sure the plugin is installed correctly (keeping the correct name)?
3) From what I understand, you're having issues with the DEMO version of the plugin.
4) Did you test it in a clean project to rule out any other problems?