Registered users holding active licenses of Volume Control addin can upgrade to Volume Control 1.1 for free. Upgrade instructions are as follows:

Upgrading from Volume Control 1.0

• Make sure Microsoft PowerPoint isn't running.
• Uninstall Volume Control 1.0:
  • Select Windows Start | Settings | Control Panel menu item.
  • Launch Add/Remove Programs.
  • Locate and select Volume Control 1.0 from the list of installed programs.
  • Click Change/Remove button. This will uninstall Volume Control 1.0 from your computer.
• Download and install Volume Control 1.1