I purchased Office Home & Student 2019 and have been using it until today. The unsupported version of Word specifically stopped working, but when I redownload the last version of Office that this license works with (16.78.3), I still can't use Word.
These is the message I get: "Activate Microsoft 365 to create and edit". I've double-checked that the version is correct, but can see the message "License: not activated". I don't know how to reactivate the license I've already purchased. When I go to my Microsoft account, I find no mention of the license, but I can see it in my purchase history.
I have a MacOS if that's useful to know.
How can I get this older version working again with the lifetime license I purchased
