1. Download and install STEPExporterForAutoCAD.exe.
2. Run AutoCAD and Load a model.
3. There’s an ‘Add-ins’ tab on the ribbon bar. It contains the following ribbon buttons as shown in the image below:  ‘Export', ‘Preference’, and 'About Us'.
4. Click on the ‘Export’ button to export the model to the .step file.
5. This will launch save as dialog in which you can specify the directory and filename of your choice.
6. The About Us button displays information about the company, product, and license details.
7. From preferences, you can set the options for the output file. The options are as follows:-
• Write Free Points - By default, points are not exported to STEP. Check this to write out points.
• Write Free Edges - By default, wire data is not exported to STEP. Check this to write wire data.
• Application Protocol - We can select the required STEP Application Protocol in which we want to export the current STEP model. AP203, AP214, AP242 these application protocols supported from this version
• Reset Defaults - Click this button to reset to default settings for STEP.

To work this plugin with AutoCAD, it is mandatory to have the Prototech Plugin Engine installed on your system machine. The installer of STEPExporterForAutoCAD will install a plug-in engine if it is not installed and further it will install STEPExporterForAutoCAD. To uninstall this plugin, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, you can uninstall it from 'Control Panel\Programs\Programs and Features' (Windows 7/8.1/10/11), just as you would uninstall any other application from your system. Note:- Uninstallation of the Plugin Engine is done separately. It can be done from the Control Panel.