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Problem:
After installing WooCommerce, the client's site stopped working due to incorrect '/it/' in rewrite rules, with the language code for the default language activated. Saving entities in WooCommerce caused the site to stop working due to .htaccess issues.
Solution:
We recommend checking the Home URL setting in your WordPress admin. Go to wp-admin > Settings > General and ensure to remove '/it' from the end of the Home URL. After adjusting the Home URL, navigate to wp-admin > Settings > Permalink and click 'Save' at the bottom of the page to flush the .htaccess file and rewrite rules. This action should resolve the issue.

If this solution does not resolve your issue or seems outdated, we highly recommend opening a new support ticket. Additionally, please check related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. For further assistance, you can also visit our support forum at WPML Support Forum.