The Media Creation Tool is the safest, most reliable method.

Locate the .cab file for the language you want to add from your Language Pack ISO (e.g., French, Spanish, German). Run the following command:

To ensure system stability and security, always obtain your installation media from official Microsoft channels. Avoid third-party torrent sites or unverified file-hosting services, which often bundle malware or modified system files. Method 1: The Microsoft Media Creation Tool (MCT)

Downloading a Windows 10 multi-language ISO file can be a convenient way to install Windows 10 on multiple devices or for backup purposes. While official sources are recommended, third-party sources can also provide multi-language ISO files. However, users must exercise caution when using third-party sources to ensure legitimacy and safety.

Select under the Architecture dropdown menu if you need x86 and x64. Choose ISO file and save it to your drive. Step-by-Step Installation and Deployment