Please refer this link for detailed information here: www.codesystems.fi/products/?product=cSysQuickProperties2018

The installer that ran when you downloaded this app/plug-in from Autodesk App Store has already installed the app/plug-in.

You can unload the plugin without uninstalling it by unchecking the "Loaded/Unloaded" check box associated with the plugin in the Inventor Add-In Manager.

You may have to restart Inventor to completely unload the application.

To remove the plugin completely, Right Mouse Button click and uninstall the application using the Autodesk App Manager tool, located on the Ribbons Tools tab > Options Panel.

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, you can uninstall it from 'Control Panel\Programs\Programs and Features' (Windows 7/8.1/10), just as you would uninstall any other application from your system.