If you need to install the pack on a machine without internet, you must obtain a .cab file (Cabinet file) specifically for your Windows 10 version and architecture (64-bit). Language packs for Windows - Microsoft Support
In this article, we'll walk you through the process of downloading and installing the Arabic language pack for Windows 10 Pro 64-bit. We'll cover the steps to follow, the different methods to use, and some troubleshooting tips to help you overcome any issues that may arise.
: Advanced users can use the Install-Language cmdlet to fetch and install the pack directly without navigating the GUI.
Windows will now download the language pack from Microsoft servers. The download size is typically 150–250 MB . Wait for it to complete.