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Problem:
I need to add a custom Currency switcher in the header of my website
Solution:
You can add the following code in the desired location (usually the header.php file):

<?php do_action('wcml_currency_switcher', array('switcher_style' => 'wcml-horizontal-list', 'format' => '%code%')); ?>

Relevant Documentation:
https://wpml.org/documentation/related-projects/woocommerce-multilingual/multi-currency-support-woocommerce/#adding-a-currency-switcher-to-the-front-end

Problem:When you purchase a product in the second language, after the checkout and the payment validation, the download link goes to 404 page.

Solution:The issue will be solved in the next version of WCML, in the meanwhile here you can check this workaround: https://wpml.org/forums/topic/404-link-to-translated-products/#post-1491961