We help installing the checkout without account in zencarts. This module is also called COWOA
This modules helps to customers to skip the long process registration and buy , where as it saves all the information about the customer when a product purchased
This is suggested by most of the seo professionals to implement such modules.
This module can be downloaded in the following link
http://www.zen-cart.com/index.php?main_page=download_contrib&contrib_id=1655&update_id=12&zenid=vbbqpr07bd32btcaea56mho540