Hi,
Our free version has the option to assign the categories for the post, but it is not possible to import the category with its fields. If you need to achieve the category import along with its slug and description, Kindly purchase our WP-Ultimate-CSV-Importer-Pro version to import it.
Also for your reference, image fields are not present in the default WordPress posts and pages categories. So in case if it is customized our product will not import the image fields into the category images column but the other default category fields like slug and description will work. On the other hand, image fields are available in default for the WooCommerce category section, In case if you are using the category import for the WooCommerce products you can surely use the Pro version to achieve your requirement.
Thanks.