Access violation at address ... in module 'vspdfeditor170.bpl'

In case Expert PDF reports the error "Access violation at address ... in module 'vspdfeditor170.bpl'", please close the software and navigate to Printers and Scanners in Control Panel, and set any printer as default.

After an important or major Windows update default printer may be deselected on some computer configurations. 

Now start Expert PDF and continue using it as normal. 

If you need further assistance please submit a new support request here.