How to update MS Office, Word, Xcel, PP etc 2011 for Mac to be compatible with Catalina?

You may find help at microsoft site; this search shows 'office' update info but generally

should be adequate find update page link or recent upgrade info.

https://support.office.com/search/results?query=office+update+for+macOS+catalina

From what I see, there may be need to buy update to office 2011 now. Its a 32-bit issue.

You could get and try free LibreOffice as it should work in new 64-bit Catalina.

I've not used MS Office, etc for a decade; sorry!