Hi, Erich!
You just need to download (not to purchase) the plugin from the link I gave you.
You are right, we are already working on implementing an import demo layout function, and of course, all content will be created using the Elementor Page builder.
until that happens this is the only way to do it.
The testimonial slider is created using the WP Bakery Page builder + Testimonials shortcode.
Regards