: The last stable release (Build 2.5.322.10) was updated on December 16, 2018. Tracker Software no longer provides active development, bug fixes, or new features for the Viewer version.
Released as a freemium application, PDF-XChange Viewer 2.5 gained popularity for its speed and advanced annotation tools.
: The final stable build (2.5.322.10) was released in December 2018. Since then, the developer has ceased all updates and bug fixes for the Viewer line. Transition to PDF-XChange Editor
: A serial key was only necessary to unlock "Pro" features, such as advanced editing or removing watermarks from specific tools.
While you might be searching for a it is important to understand the current state of this software and the risks associated with "extra quality" or "cracked" license keys found on the web.
If you need the "Pro" features—like deleting pages, moving text, or advanced editing—the safest route is to purchase a legitimate license.
: Tracker Software no longer sells standalone license keys for PDF-XChange Viewer.