Open an Autodesk® 3ds Max® scene that is missing bitmaps/proxies/ies lights/anything.

Run 'Relink Bitmaps' (Relink Bitmap button can be seen under Exchange Store Menu, refer screenshot "Menu")

Click "Browse" to select a place for Relink Bitmaps to search for the missing maps

Click "Relink"

You can add paths that you use often to easily select from.  

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) and uninstall as you would any other application from your system.