Hi,
For win11, there is no .cab format language pack to be downloaded. Staring from win11, non-administrator user accounts can now add both the display language and its corresponding language features, which means we don't need to pre-install language packs for users.
If you prefer to install the language offline (without Internet), you may refer to this non-official article.
Note: this is NOT from Microsoft, just for your reference.
Regards,
Alex