Autodesk released AutoCAD 2013 today.
We released new versions of Design Master HVAC, Electrical, and Plumbing that are compatible with AutoCAD 2013. They also restore support for AutoCAD 2004, 2005, and 2006, which we dropped last summer.
See the Installing an Update page for information on installing the new version.
If you want to install it on AutoCAD 2013, you will need to contact us for a new license file.
If you want to install it on AutoCAD 2004, 2005, or 2006, your current license file will work.