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You must have a valid license key. This software cannot be activated for free. download microsoft office 2008 dmg for mac os link
Before attempting to install Office 2008, users must consider the version of macOS they are running: 32-Bit Architecture : Office 2008 is a 32-bit application suite. Incompatibility with Modern macOS : Since the release of macOS Catalina (10.15) If you cannot find a working product key