Registered users holding active licenses of PowerShow addin can upgrade to PowerShow 6.8 for free. Upgrade instructions are as follows:

Upgrading from previous version of PowerShow

• Make sure Microsoft PowerPoint is not running.
• Uninstall PowerShow:
  • Select Windows Start | Settings | Control Panel menu item.
  • Launch Add/Remove Programs.
  • Locate and select OfficeOne PowerShow from the list of installed programs.
  • Click Change/Remove button. This will uninstall OfficeOne PowerShow from your computer.
• Download and install PowerShow 6.8.