I’m sorry, but the errors have nothing to do with the theme. As I can see on your screenshot you don’t installed the Woocommerce plugin before you imported the demo content, that’s why you see the plain shortcode. If you want to use Woocommerce and Easy Digital Downloads (we used both plugins in our demo to show the possibilities to sell products), then you need to install both plugins before you import the demo content. If you don’t want to sell products on your website, you can delete the shortcodes in the page content.
The Home Page 404 Error is surely for the permalink settings, it’s a typical problem with WordPress. You can solve it by setting the permalink settings to “default”, save it, and set it again to the custom permalink structure. Also this is not a problem of the theme.