For iTunes 6.0.4.2 (downloaded/installed as of 06-JUN-2006), the GUID used in the path to the installation cache is different than the one mentiond in an earlier post. For me, I found the unpacked iTunes MSI under "%windir%\Downloaded Installations\{59C4F14F-7590-45FC-BE9F-A67AB3590709}". If you find multiple versions of iTunes in the "Downloaded Installations" directory, you can identify the version of each set of cached installation files by examining "setup.ini" or the MSI file itself.
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