microsoft office

Office 2011 for Mac was retired in Oct 2017, and because it is a 32-bit application suite, it is disabled on macOS Catalina and later that strictly require 64-bit applications. If you are not using MS Office for document sharing with remote co-workers, then you can get by with the free 64-bit LibreOffice Suite as it is an MS Office superset, and will handle your existing documents.

If you are part of a remote workforce that is sharing MS Office documents, then I strongly suggest obtaining either the current Microsoft 365 (subscription) or Office 2019 for Mac (single-purchase) as not only are these currently supported by Microsoft, they also do not introduce any unique LibreOffice features that may not be in current MS Office products.

Microsoft killed Office 2011 about four years ago. Not sure why they waited so long.

2016 was the only version worth a **** since before Office 6. They should have killed it off when they released 2016.

Instead of using outdated MS Software and paying for New MS $$ - try the free LibreOffice for Mac. It can do almost as much as MS at a fraction of the cost plus can open and save MS files natively