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To import the attributes and variations, you need the Premium version: https://www.fredericgilles.net/fg-magento-to-woocommerce/
For the brands, you also need the Brands add-on: https://www.fredericgilles.net/fg-magento-to-woocommerce/brands/
Please note that you will have to restart the import from scratch with the Premium version to import the products with their attributes and variations.