These are the steps to add Viewport Coordinates: 

1. Type ViewportCoordinates at the command line.
2. Select viewports.
3. Press Enter to end the viewport selection.
4. The command will add MText with the coordinates adjacent to each viewport corner.

Use the ViewportCoordinatesSettings command to change how MTEXT object is created. 

1. Type ViewportCoordinatesSettings at the command line. 
2. "Enter precision for coordinates:". This is how many decimal points are included in the coordinate values. 
3. "Enter easting text:". This is the text added to the easting coordinate. 
4. "Enter northing text:". This is the text added to the northing coordinate.  
5. "Add northing and easting as prefix?". If Yes, it adds the easting and northing to text in front of the northing and easting values. If No, it adds the easting and northing text after the northing and easting values. 
6. "Enter Y offset from viewport point:". Specifies the distance from the viewport the MTEXT is created at. 
7. "Enter MText Height:". Specifies the text height. 

Use the ViewportCoordinatesUpdate and ViewportCoordinatesUpdateAll commands to update the Viewport Coordinate MText objects to reflect viewport changes. 

1. Type ViewportCoordinatesUpdate or ViewportCoordinatesUpdateAll at the command line. 
2. If ViewportCoordinatesUpdate is run, only the viewports on the current layout tab will be updated.  
3. If ViewportCoordinatesUpdateAll is run, all of the viewports in the drawing will be updated.

Use the ViewportCoordinatesRemove command to remove the association between the viewports and the coordinates. 

1. Type ViewportCoordinatesRemove at the command line. 
2. Select the viewports to remove the Viewport Coordinates from. 
3. "Delete added Mtext objects?". If Yes, the MText objects will be deleted. If No, the MText objects will remain in the drawing and the Viewport link will be removed and will no longer be updated. 
4. The command will then either delete the MText objects or remove the link. 

The installer that ran when you downloaded this app/plug-in from Autodesk App Store will start installing the app/plug-in. OR, simply double-click the downloaded installer to install the app/plugin. You may need to restart the Autodesk product to activate the app/plug-in. To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button. OR, click Control Panel > Programs > Programs and Features (Windows 7/8.1/10/11) and uninstall as you would any other application from your system.

None.