Hello,
1. XStore import files you can download from this page – https://www.8theme.com/downloads/
Or just use page importer – https://youtu.be/wkIKN2IyEZI (sliders will be imported together with the demo content)
2. Theme Options > WooCommerce (Shop) > Single product page > Tabs
3. Theme Options > Header builder > Newsletter. Enable WPBakery Page Builder for static blocks – https://xstore.helpscoutdocs.com/article/101-wpbakery-page-builder
Regards