Microsoft does not provide a direct public download link for standalone .cab files for consumers on their website; they are distributed via Windows Update. However, IT professionals often use specific repositories or the "Language Pack DVD" provided with Volume Licensing.
On the left-hand sidebar, select Language (in older versions of Windows 10, this may be labeled "Region & Language"). Download Arabic Language Pack For Windows 10 Pro 64 Bit
After reboot, check these indicators:
: Adds the Arabic keyboard layout and essential proofing tools like spell checking and text prediction. Microsoft does not provide a direct public download