Scroll to the "Step 1: Install the language accessory pack" section. Select the Office 2016 from the "Which language do you need?" drop-down menu. Download (64-bit) Run the downloaded file to start the installation. Microsoft Support Configuration Steps
The Microsoft Office 2016 Language Pack for Arabic (64-bit) adds Arabic language support to Office 2016 applications by providing display language, Proofing tools (spelling, grammar, hyphenation, and thesaurus where available), and localized Help content. It enables users whose preferred language is Arabic to use the Office interface, create and edit documents in Arabic, and proofread Arabic text accurately.
Before downloading anything, open any Office app (Word, Excel). Go to . Look under "About Excel." If it says 32-bit , you cannot install the 64-bit pack. If you try, the installer will fail with a "Click-to-Run vs MSI" or "Architecture mismatch" error.
Before installing the 64-bit Arabic language pack, ensure your system meets these requirements: Matching Architecture: You must have the 64-bit version of Office 2016