When the Registration tab is selected the following options are available:
Figure 1. Preferences Dialog Box, Registration Tab Selected
The Registration tab is used to register/edit license keys for PDF-XChange Editor. Current versions and their details are displayed in the Installed License Keys pane.
•Click Add New License Key to add new license keys.
•Click Remove to remove current license keys.
•Select the Hide all licensed features from toolbars and menus box to remove licensed features from the free version of PDF-XChange Editor.
Click Apply to apply changes and OK to save changes.