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The solution to this problem is to install the troubleshooter from Microsoft: Fix problems that block programs from being installed or removed (microsoft.com) so that you can both identify and uninstall hidden software, which has been installed on your hard drive. This process will also help you uninstall hidden identical version of Unreal Datasmith Exporter.
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This identical version of Unreal Datasmith Exporter has never been installed in any particular directory on my computer.