AVC0X - macOS - How to Reinput Serial Number on macOS
AVC0X - macOS - How to Reinput Serial Number on macOS?
How to get the Serial Panel Back on Mac OS.
  A. Connect the USB Grabber with MacBook & Connect RCA to DVD or other RCA enabled devices.
  B. Hold Down "Command" & "Option" Keys at the same time.
  C. Then click & run "ezcap VideoCapture".
  D. The Serial Panel will pop out.
  E. Input the correct Serial Number.