You can find your download ID at https://marketing-rocket.com/download-id
It seems your download ID is not authenticating with the Marketing Rocket Servers. You can skip this for now, and add your download ID later by going into OPTIONS -> Live Update, found on the marketing rocket dashboard.
For better SEO for your landings , Marketing Rocket uses a Joomla menu item, please enter the menu item name Your Url will be like this : {{$ctrl.origin}}/{{$ctrl.menuName | lowercase | alias}}/landing-name