. ABViewer is a multi-functional CAD application, and its registration process varies depending on whether you are using a standard User License or a corporate Floating License. CADSoftTools How to Register a User License
If you're having trouble with ABViewer, including registration or technical issues, the CADKraft support team is a good resource. They offer documentation, tutorials, and customer support to help users get the most out of their software.
However, a quick search online reveals a dark underbelly of the ABViewer user community. Thousands of searches are made every month for phrases like or "ABViewer serial number."