Hi @vincent manzari ,
According to the official documentation, the normal steps to install a language pack are to run the SharePoint Product Configuration Wizard, which will cause a short downtime.
Regarding ZDP, you can refer to this article.
Thanks,
Yanli Jiang
*
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.