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Setup cannot continue because a required file is either corrupted or not available.
This error may come up if you are using an unlicensed copy of Microsoft Office. The fix?
First, go over to a Microsoft support page and download the Windows Installer Cleanup Utility Package. This cleans all traces of Microsoft 2007 in your system. Once that’s done, simply reinstall a licensed version of he software and you should be good to go.
Note: Run Windows Installer Cleanup Utility Package as Administrator.