Check if there's any official information on where to enter the serial key. Typically, it's during installation or in the software's activation window. The user might be a victim of a scam, so warning them about fake serial keys is important too.
While users often search for "serial keys" for this older version, the most reliable and secure way to activate ConvertXtoDVD is through an official license from VSO Software . Major version 6 - Version History: ConvertXtoDVD vso convertxtodvd 6 0 0 80 serial key