1. For WPBakery Page Builder license, you don’t need to activate the license. Our theme feature will still work fine without activating the license for that plugin and when that plugin has an updated version we will include it in next theme update.
2. May I know which plugin that you mean on this thing?
3. About import demo, when importing demo you need to wait for a moment. It because the system importing several data like post, page, image, widget, style and etc into your site. Did you get any error message in there?