The command interface is straightforward and intuitive. 

The command itself can be easily found either at Ribbon, quickly added to the Toolbar or just typed in from the command prompt.

After invoking the Selectequal command, you will be prompted to select an object.

All equal objects in the drawing will be then selected.

Pressing Enter or Esc instead of selecting an object will scan the whole drawing for copies.

Note: Same shape objects created by different ways or mirrored copies may not be selected!

Run the plug-in executable file, downloaded from the Autodesk App Store to start installing the plug-in. Follow instructions.

To uninstall this plug-in, exit the Autodesk product if you are currently running it, click Control Panel > Programs > Programs and Features (Windows 10/11), and uninstall as you would any other application from your system.