W10 11langpack.ps1 !link! →

: It leverages the fact that Windows 10 and 11 often share identical SHA-1 values for many language packages, ensuring compatibility across the "family" of versions.

Every language pack adds roughly 1GB to 3GB to the final WIM file size. If your organization only requires specific regions, do not build a single "mega-image" containing 30 languages. Instead, use the script to create localized regional variants (e.g., an EMEA image vs. an APAC image). Handling Error 0x800f081f (Source Not Found) w10 11langpack.ps1