
From the Archicad Help menu, choose License Information.If an MEP license is available but has not been automatically reserved for you, you can reserve it manually: Note: To reserve a MEP Modeler license every time you start Archicad, check the “Reserve MEP Modeler license when Archicad starts” option in MEP Preferences dialog.

(This license can either be located on a hardware protection key, or a network license.) The license is automatically reserved when you start any of the MEP functions, provided that a free license is available. To run MEP Modeler with your commercially licensed copy of Archicad, you need a separate license for MEP Modeler. Locate the desired language and OS version in the list below (MEP Modeler Download Packages) and download the installer. Further language versions are uploaded continually.
