Here is the detailed guide, divided into two methods depending on your specific situation.
You cannot easily download a single .cab file for Arabic from Microsoft's website legally. However, if you have a Windows 10 ISO , the language packs are embedded inside it.
Note the version number (e.g., , 21H2, or 20H4) and the OS Build number.
If you encounter issues during the download or installation process:
This method works completely offline because it pulls the files from your local storage.
The "Install or uninstall display languages" wizard flickered to life.