If you have lost your original product key, you don't necessarily have to buy a brand-new unit. Here is how you should proceed:

Most people don't know that VLC has a "Convert/Save" feature that can capture video from an external device.

If you have proof of purchase, the official VIDBOX support team can often help you recover a lost key.

Sometimes, the serial number or key is printed on a sticker directly on the USB capture device. Best Free Alternatives for VHS to Digital