[Закрытые] missing WooCommerce Multilingual & Multicurrency under WooCommerce sidebar

Background of the issue:
I am trying to create translations of WooCommerce products. You can see the issue on this page: скрытая ссылка

Symptoms:
I expected to see product SKUs with other data duplicated to other language versions, but instead, SKUs cannot be added and other data is not duplicated.

Questions:
I have the WooCommerce Multilingual & Multicurrency plugin installed both on my Production site and test site. However, on my production site, I cannot find the WooCommerce Multilingual & Multicurrency plugin available under the side bar menu of WooCommerce, where I can find that in my test site. So I test to create a variable product with two SKUs and make a translation. Then the SKUs is duplicated to the lanuage version. Which it is not happening to my production site. Please refer to the Woo-test-1.PNG screenshot as the plugin info of my test site. I am using older version than the plugin I am using on the production site, and the SKUs is duplicated on my test site no problem.