Run the setup.exe found within your THMYL or official language pack folder.
Because Office 2007 has reached its end of support, official Microsoft downloads are largely unavailable. However, the following methods are common: Microsoft Learn Check for Pre-installed Packs Start Menu Microsoft Office 2007 Microsoft Office Tools Microsoft Office 2007 Language Preferences to see if Arabic is already listed. Legacy Sources Some users utilize archives like the Internet Archive thmyl microsoft office 2007 language pack arabic