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If you want MapInfo Pro v2019, we haven't all the languages ready yet.
For MapInfo Pro v17, and v2019 once the languages have been made ready, all the languages are part of the installer. When you install MapInfo Pro, you select the language that you want as your primary language.
You can also launch MapInfo Pro in other languages by adding a -UILocale parameter. Read more about this in this post.
For the earlier versions of MapInfo Pro, you would need a dedicated installer for the individual languages.