Download of DupDetector 3.302 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The software lies within Photo & Graphics Tools, more precisely Viewers & Editors.
The following versions: 3.3 and 3.2 are the most frequently downloaded ones by the program users. DupDetector is suitable for 32-bit versions of Windows XP/XP Professional/Vista/7/8/10/11. Commonly, this program's installer has the following filename: DupDetector.exe. This free program is a product of Prismatic Software. We recommend checking the downloaded files with any free antivirus.
From the developer:
DupDetector is a utility for finding and removing duplicate and near duplicate images from your image collections.
You may want to check out more software, such as Dup Detector, which might be similar to DupDetector.