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InstallerClean is a free, open source utility published by No Faff that addresses a common storage problem on Windows systems: the hidden C:\Windows\Installer folder, which grows steadily as software is installed and updated, accumulating files that are no longer needed. Falling into the category of disk cleanup and system maintenance tools, InstallerClean is designed to identify and remove these orphaned files safely. Rather than simply flagging everything in the folder, it takes a careful verification approach: it queries Windows Installer directly to learn which files the service still holds a record of, and it cross-checks the same information by reading the corresponding records stored in the registry. A file is only offered for removal when nothing installed on the machine claims it, or when a newer patch has already superseded it. In cases where the tool cannot obtain a definitive answer about a file's status, it errs on the side of caution and holds the file back rather than risking damage to installed applications. When files are confirmed as safe to remove, users are given two handling options: Delete, which permanently erases the files, or Move, which relocates them to a folder of the user's choosing, providing a reversible alternative for those who prefer an extra margin of safety. This makes the software suitable both for general users looking to reclaim disk space and for more cautious administrators who want control over where recovered files go. InstallerClean contains no advertising and collects no telemetry, keeping with its open source distribution model. The software has been maintained across 18 versions, and the current release is version 3.0.0, reflecting ongoing development of the tool's ability to safely clean one of the most opaque storage locations in the Windows operating system.
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