Serial Number Stopped Working
First of all you should understand WHY this happens. Please read this.
Second: Email me and say that you need your activations reset. If you've already emailed me, then I've probably already reset your activations, you should be good to go now, give it a try. Remember: Copy and Paste your serial number if you need to, please do NOT type it. the Letter "Oh"s and the Zeroes are not easy to distinguish.
Your kJams serial number starts "KJAMLIT" or "KJAMPRO", copy that, then run kJams and go Help->Enter Serial Number, now paste and hit OK.
Your Burning Plugin serial number starts with "KJAMBRN". Copy that, then run kJams and go to Preferences->Burner. Click the "Enter Serial Number" button, paste, hit OK.
- More info in Serial Numbers