There are two ways to enter the feature recognition environment.

One is when you open a part document with non-parametric feature in it, you will be prompted to enter the feature recognition environment.

The other is one you can right click a non-parametric feature and choose Recognize Features command to enter feature recognition environment.

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 10/11) just as you would uninstall any other application from your system.

For more details about the feature recognition functions you can refer to the documentary FRHelp.chm which can be found in %ProgramData%\Autodesk\ApplicationPlugins\Autodesk FeatureRecognition.bundle\Contents\Resources\Help folder.