Hi, I cannot find the ecommerce.html in the downloaded vue demo2 which is available in the preview.
I guess that you confused the HTML version preview with the Vue version preview.
You can check the Vue preview page here:
At the moment in the Vue version we do not have an e-commerce app we will consider adding it in upcoming releases.
Styles and an HTML markup are already included in our HTML version so you can easily migrate the e-commerce page for vue, let me know if you will need any help on this.