The latest version of the Duplicate Scorer (17.8.5) has a dependency on Club Database Manager version 1.3.5 or later. If you are using an older version of Club Database Manager then you must upgrade to the latest Club Option Pack before attempting to install Duplicate Scorer 17.8.5. To check which version of Club Database Manager you are currently using, start the application then click on the Help menu and choose About.
To upgrade to the latest Club Option Pack, click here.