Installing Windows 10 language packs offline requires specific installation media and administrative tools, as standard methods typically rely on an active internet connection Core Installation Methods
DISM /Online /Add-Capability /CapabilityName:Language.TextToSpeech~~~es-ES~0.0.1.0
Need a specific language? The codes are standard: de-DE (German), fr-FR (French), zh-TW (Traditional Chinese), hi-IN (Hindi), ar-SA (Arabic). Always match your build number first. Microsoft Windows 10 Language Pack Offline Install -Extra
lp.cab Files (Recommended for IT Pros)