If possible, compare the file size and hash with known original versions.

Downloading software from third-party "free download" sites carries risks.

Office 2008 is a 32-bit application . It will not run on macOS Catalina (10.15) or any newer versions (Big Sur, Monterey, Ventura, Sonoma), as these operating systems dropped support for 32-bit apps entirely. Installation Steps

This is the most reliable source for "abandonware" or legacy software. Users often upload ISO or DMG rips of original installation media. Search for "Office 2008 for Mac DMG" on Archive.org.

The base version (12.0.0) is often buggy on later OS versions like Lion or Mountain Lion. You should search for the Office 2008 Service Pack 2 (12.2.0) and the final 12.3.6 Update to ensure maximum stability. Important Safety Warning

You can use Word and Excel for free in a web browser with a standard Microsoft account.

Mac OS X 10.4.9 (Tiger) through Mac OS X 10.6.8 (Snow Leopard). RAM: Minimum 512 MB. Hard Disk: Roughly 1.5 GB of available space.

Are you trying to install this on a Mac or a more modern Intel/Apple Silicon machine?