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How do I update to 64bit for use with Catalina
You can see what Apps might need it...
Go64...
https://www.stclairsoft.com/Go64/
For MS Office, Look into the Free LibreOffice, it handles MS Office files…
Feature Comparison of LibreOffice v6.3 with Office 365/Office 2019 for Mac
https://wiki.documentfoundation.org/Feature_Comparison:_LibreOffice_-_Microsoft_Office
Update what? Apple computers have been 64 bit for over a decade. If you are asking about a third party app contact the app developer.
UpdaTE TO 64 BIT
