Firstly, apologies if this is the wrong support thread, I'm not sure which version of the plugin our website's using and not sure how to find out.
We just want to add an EAN to our product feed, should be simple, right? 
We tried setting the EAN/UPC value in the feed config to true and tried putting the EAN in the UPC field on our product listings, and we got an error when trying to upload the feed. The error is as follows:
Code:
Processing: Feed - Yes, Upload - No
1054 Unknown column 'p.products_ean' in 'field list'
in:
[SELECT distinct(pd.products_name), p.products_id, p.products_model, pd.products_description, p.products_image, p.products_tax_class_id, p.products_price_sorter, p.products_priced_by_attribute, p.products_type, GREATEST(p.products_date_added, IFNULL(p.products_last_modified, 0), IFNULL(p.products_date_available, 0)) AS base_date, p.products_date_available, m.manufacturers_name, p.products_quantity, pt.type_handler, p.products_condition, p.adwords_labels, p.excluded_destinations, p.products_weight, p.products_upc, p.products_isbn, p.products_ean FROM products p LEFT JOIN manufacturers m ON (p.manufacturers_id = m.manufacturers_id) LEFT JOIN products_description pd ON (p.products_id = pd.products_id) LEFT JOIN product_types pt ON (p.products_type=pt.type_id)WHERE p.products_status = 1 AND p.products_type <> 3 AND p.product_is_call <> 1 AND p.product_is_free <> 1 AND pd.language_id = 1 GROUP BY pd.products_name ORDER BY p.products_id ASC;]
Ideally we'd like to just add a new field into our product listings to input the EAN, but not sure what edit we'd have to make to the plugin code to make it recognize that field as the EAN and give that info to Google.
Any help at all would be greatly appreciated. The site is ravsappliances.com, running on Zencart version 1.3.8a