Please double check your tax settings and your product settings to check you have the taxed and unataxed amounts correctly setup. By default WooCommerce does not include a tax rate amount. This needs to be setup in WooCommerce > Settings > Tax. We recommend the following checks before the plugin works:

1) Tax Rates and Calculations must be switched on
WP Admin > WooCommerce > Settings > General “Enable tax rates and calculations”

2) Tax Rate must be set
WP Admin > WooCommerce > Settings > Tax > Standard Rates + Insert Row with your Tax info

3) Calculate tax based on “Shop Base Address” (Unless you make all your customers register with their address before browsing).
WP Admin > WooCommerce > Settings > Tax > Calculate tax based on “Shop Base Address”

4) Individual Product must be marked as Taxable
WP Admin > Products > Product > Product Data > Tax Status > Product should be “Taxable”

The plugin is set up for the strings to be translated by popular programs such as WPML and Polylang. If you want to translate the strings for just one language, here is a code snippet to add to your functions.php file – https://gist.github.com/thetwopct/6b6935c213b0d5b85b8e8ea9dcf6ac12. The code example is also included in the root of the plugin folder in translation-example.php

Yes, we would love to hear improvements for this plugin. Please leave a support comment to get started.