The latest version of Microsoft Office that is compatible with Mac OS Catalina (10.15) is version 16.66, which was released in October 2022. This version is part of the Office 365 suite and is specifically noted as the final build that supports macOS Catalina.

For users interested in the details, various sources confirm that version 16.66 is the last iteration available for this macOS version, and Microsoft has indicated that newer updates following this version no longer support Catalina. Notably, the September 2023 update (version 16.77) is the last build compatible with macOS Big Sur, not Catalina.

It is also important to highlight that MacOS Catalina requires applications to be 64-bit, meaning any 32-bit versions of Microsoft Office will not work on this operating system. Users could still run 64-bit versions, including Office 2019, but ensure they are updated to at least build 16.66.

For further details, you can refer to the sources below:

1. Microsoft Community Discussion
2. Microsoft Support
3. Apple Support Communities
4. Quora Discussion
5. Reddit Query
6. Microsoft Q&A for downloading Office 2019
7. Expert Q&A on downloading Office for Mac

Make sure to install and update your Office to this version to ensure compatibility with macOS Catalina.

Sources

Which Office version to get for Catalina 10.15.7 - Microsoft CommunityUpgrade macOS to continue receiving Microsoft 365 and Office for ...Catalina Compatibility with MS Office - Apple Support CommunitiesWhat Microsoft Office version is compatible with Catalina? - QuoraMicrosoft Office for Mac OS Catalina-What version I should download?Need to download office 2019 for macOS Catalina - Microsoft Q&AHow to Download and Install Office for Mac Catalina | Expert Q&A

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