You need to install and activate WooCommerce before installing WP-Lister Pro for eBay.
Import from eBay to WooCommerce is an add-on plugin which require WP-Lister to work. It is designed for migrating all items from eBay to WooCommerce once. You can manage and sync items from that point on with WP-Lister Pro for eBay.
***Please read Troubleshooting & FAQ for Installation Guide, How to Update, Turning off License Activation Notices, etc.