To add the ARX plugin to Autodesk Navisworks Exporter Plugins installation
- In the Control Panel, double-click Add or Remove Programs. 
- In the Add or Remove Programs dialog box, click Autodesk Navisworks 2015 Exporter Plugins, and then click Uninstall/Change in Windows 7. 
- In the Installation wizard, click Add or Remove Features. 
- On the Select Exporters to Install page, the Export From Other Applications node, select the check box next to the required plugin. 
- Click Next. 
- On the Autodesk Navisworks 2015  Update Exporter Plugins page, click Next. 
- On the Update Complete page, you are informed when the updates have been performed. Click Finish.