Our WooCommerce themes work with the standard WooCommerce plugin. If you didn't import a demo, set the store up like this:
1. Install and activate WooCommerce from Plugins → Add New. 2. Run the WooCommerce setup wizard (store address, currency, payments, shipping). 3. Go to WooCommerce → Status → Tools and confirm the store pages (Shop, Cart, Checkout, My Account) exist. If not, use "Create default WooCommerce pages". 4. Add a few products so the shop and product pages have something to display. 5. Go to Appearance → Customize to set your shop layout, number of products per row, and product page options.
If product images look stretched or the wrong size, go to Settings → Regenerate thumbnails after changing image sizes (the "Regenerate Thumbnails" plugin does this in bulk).