"Force Translation Upgrade" hasn't been display.

Read https://docs.woothemes.com/document/woocommerce-localization/ – it has been updated. This button no longer exists.

Hi there,
Thank for this support.

As said in that links: “When you install or update WooCommerce, WordPress will look for a 100% complete translation in your language and automatically download it”

But it’s not possible automatically donwload the translation of woocommerce. My project is running on localhost.

Do you have any suggestion? Thanks.

Read the doc; it covers manual install.