Apple completely dropped support for 32-bit applications starting with macOS Catalina. Because Office 2008 is strictly a 32-bit suite, the operating system will block it from launching entirely. How to Install Office 2008 from a DMG File
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However, Office 2008 was also the first version to drop support for , which meant existing macros from Office 2004 could not be used. This was a significant drawback for power users who relied on automation. download microsoft office 2008 dmg for mac os link