When Premium plugins are Bundled with the theme, you can use the plugins without any problem. All plugins are fully functional even though you don’t get a plugins purchase code for Activation.
Since you purchased a Bundled product, you DO NOT have a license key for that plugins so you can’t enter anything in this field. Updates to the plugins are provided when the theme itself is updated and or via Tickets or via Email.
However, if you want automatic updates and support from the plugin developer you need to purchase it Separately, this is 100% optional.