If you're running an older version of DbVisualizer, you find the corresponding Users Guides in HTML (online) and PDF (download) formats here:

DbVisualizer 11.0HTML
DbVisualizer 10.0HTML
DbVisualizer 9.5HTML
DbVisualizer 9.2HTML
DbVisualizer 9.1HTML
DbVisualizer 9.0HTML
DbVisualizer 8.0HTML
DbVisualizer 7.1HTML
DbVisualizer 7.0HTML
DbVisualizer 6.5HTML
DbVisualizer 6.0HTML
DbVisualizer 5.1HTML
DbVisualizer 4.3HTML
DbVisualizer 4.2HTML
DbVisualizer 4.0HTML