Visit the VIDBOX Find My Product Key page. If you registered your software previously, you can enter your email address to have the key resent to you.
If the physical copy is lost, use these methods to recover it from the software itself or the manufacturer:
Some retail versions include the key on the back of the printed manual.
This is the most recommended alternative. Users suggest plugging your VIDBOX adapter into your PC, opening OBS Studio , and adding the adapter as a "Video Capture Device".
Some have success using the "Open Capture Device" feature in VLC , though it can sometimes be more temperamental than OBS.