ICEcat Product Catalogue Integration Addon for Store Manager for PrestaShop allows you to update products at your PrestaShop store with descriptions and images and other information from ICEcat product catalog.
You can find general information on the addon and its trial version here - http://www.prestashopmanager.com/prestashop-icecat-integration
Documentation with step-by-step manuals which explain how to perform main operations is available at: http://icecat-product-catalogue-integration-documentation.emagicone.com/
If you have any specific questions on the product, post them here and we will gladly answer them.