Hi Mark,
Following are the steps to install Express Tools.
Windows Control Panel>>Add/Remove Programs>>Select "AutoCAD Mechanical 2010">>Uninstall/Change>>In the Unistall page>>Select "Add or Remove Features">>Click Next button twice and on the 3rd page (Add/Remove page) >>Enable "Express Tools" and finish the installation. Find attached image.
Thanks,
Sridhar
Software QA Engineer
Autodesk, Inc
Please select the Accept as Solution button if my post solves your issue or answers your question.
Sridhar Subramani
Senior Product Owner