tax payable to country field missing

That field has been removed from the plugin because it’s no longer used. It was a draft of a feature that was not fully implemented. The column was left in the database for backward compatibility.

If the column is missing from the database, then something prevented the EU VAT Assistant from creating it. You can add it manually by adding a column called tax_payable_to_country to the woocommerce_tax_rates table. The column type should be VARCHAR(200) (way large, but that’s the format it had at the beginning).

Sample SQL statement, for reference:

ALTER TABLE wp_woocommerce_tax_rates
ADD COLUMN tax_payable_to_country VARCHAR(200)

Note
Replace the wp_ prefix in wp_woocommerce_tax_rates with the appropriate prefix.