Free version: Advanced Shipping Rates for WooCommerce
If you are an Advanced Shipping Rates for WooCommerce free user, you can ask for help or provide feedback on the wordpress.org repository:
Get support on wordpress.org Go to wordpress.org plugin page
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Advanced Shipping Rates for WooCommerce PRO
If you are an Advanced Shipping Rates for WooCommerce PRO user, you can ask for help or provide feedback at Wp-Centrics website.
You can also register your plugin to get a serial number and enable the automated updates:
Get PRO support Go to PRO license page