Problem: get a sensei course with Polish as its primary language to translate into English as its secondary language; I get 404 on the course page, despite it being visible at the courses overview page
Solution: using the directory option in WPML -> Languages -> Language URL format solves the issue
2. If above does not work, you can remove WooCommerce Multilingual plugin and re-install it again after downloading plugin from downloads page: https://wpml.org/account/downloads/
