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- Yes, it is the one from the steps to use the proper language. Only the user's choice has higher priority.
- Yes, it will if the module contains the some upgraded parts. As usually, you need to have the actual backup before the upgrade.
- It's better to download your module locally because the UNA upgrade is sensitive to the non-usual files in the whole UNA's directory. I mean if you will have the file zm.php in the root of UNA - the upgrade will notice that.