Registered users holding active licenses of OfficeOne PowerViewer can upgrade to OfficeOne PowerViewer 2.5 for free. Upgrade instructions are as follows:

Upgrading from previous version of PowerViewer

• Make sure OfficeOne PowerViewer is not running.
• Uninstall PowerViewer:
  • Select Windows Start | Settings | Control Panel menu item.
  • Launch Add/Remove Programs.
  • Locate and select OfficeOne PowerViewer from the list of installed programs.
  • Click Change/Remove button. This will uninstall OfficeOne PowerViewer from your computer.
• Download and install OfficeOne PowerViewer 2.5.