Duplicate Preventer 2.0 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. We recommend checking the downloaded files with any free antivirus. Duplicate Preventer lies within Office Tools, more precisely Document management. This software was originally created by Nimble Software.
From the developer:
Duplicate Preventer is a Microsoft Excel add-in that helps to prevent entering duplicate data while working in Excel. Duplicate Preventer integrates into MS Excel by placing its toolbar into the Excel toolbar area. The add-in allows defining where to check for duplicates in the active row, column or only in a selected area. The duplicate tracking is optionally possible with exactly the same data and data within different letter cases.
You may want to check out more software, such as Excel Duplicate Manager or Delete Duplicate Images, which might be similar to Duplicate Preventer.
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