1 Click the Download button on this page, and then save OffCAT.msi to your hard disk. 2  Double-click the OffCAT.msi file on your hard disk to start the installation of OffCAT v2.1. 3  To start the Office Configuration Analyzer Tool, click the Microsoft Office Configuration Analyzer Tool icon on the Start menu. Open Control Panel. 2  In Control Panel under Programs, select Uninstall a program. 3  In the list of currently installed programs, select Microsoft Office Configuration Analyzer Tool 2.1, and then click Uninstall.