Hi, thank you for coming to the forum. I will be happy to assist in the best way I can.
Did you mean to download it without the internet? However, you may need an internet connection to be able to download the language pack.
- Select the Start button, and then select Settings > Time & Language > Language.
- Under Preferred languages, select Add a language.
- Under Choose a language to install, select or type the name of the language that you want to download and install, and then select Next.
- Under Install language features, select the features that you want to use in the language that you selected to download, and then select Install.
Please click this link to see what languages you can download in Windows 10.
https://support.microsoft.com/windows/a5094319-a92d-18de-5b53-1cfc697cfca8
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