Install WooCommerce plugin buy going to Plugins -> Add New
and enter "woocommerce" as Search term and follow the simple
After activating WooCommerce plugin, the plugin will show a message box on top indicating whether you want to install shopping pages.
Now there are two options for you:
If you are going to manually configure all WooCommerce estore settings then click "Install woocommerce pages" and follow instructions it provides.
If you have already imported demo content data (i.e. import xml file) just like from http://templatation.com/justshop/layout2/, then you should click "Skip Setup" because pre-built WooCommerce pages are already packaged with the demo xml inside your downloaded zip. Therefore, no need to install them again.
If you are facing problem installing WooCommerce plugin, please view: