version of Office 2016. Language packs must match the architecture of the base installation; a 64-bit pack will not install on 32-bit Office. Check Architecture: Open Word, go to File > Account > About Word . It will explicitly state "32-bit" or "64-bit." 2. Download and Run Visit the official Microsoft Language Accessory Pack Office 2016 from the version list. from the language dropdown and select the Download (32-bit) Run the downloaded file and follow the on-screen prompts. 3. Activate Arabic Interface After installation, you must manually set the preferences: Open any Office app (e.g., Word) and go to File > Options > Language Editing Languages: