Installing Nitro Pro 9 will not override or uninstall any previous versions of Nitro Pro that you have on your computer. To remove the previous version from your computer you will need to uninstall the older version by following the steps below.
Open the Windows Control Panel.
Go to Add/Remove Programs (Win XP) or Uninstall a program (Win Vista/7).
Select the Nitro application you wish to uninstall.