PatchCleaner

Key details of

Identify Orphaned Files: Scans the C:\Windows\Installer directory to find .msi and .msp files that are no longer associated with any installed applications.
Safe Cleanup Options: Allows users to either move orphaned files to a different location or delete them permanently, providing flexibility and safety during cleanup.
Exclusion Filters: Includes pre-configured filters to exclude certain files, such as Adobe Acrobat patches, from being marked as orphaned, preventing potential issues with updates.
No Installation Required: Available as a portable version, making it convenient to use without installation.
Freeware: PatchCleaner is completely free to use.

According to HomeDev, PatchCleaner identifies redundant installer files and offers two options:Move

Them to another location as a precautionary measure.
Delete them to free up disk space.The utility operates by comparing the list of known .msi and .msp files, accessible via Windows Management Instrumentation (WMI) calls, against the files present in the C:\Windows\Installer directory. Files not found in the WMI list are considered and are flagged for action.