Office 2019 for Mac would be the version to target for longest support. The reason 2011 didn't have an upgrade path is its support ended in 2017.
I just tried the packagefile from the link, and after installing I am still stuck with MS office 365.
At this point, libreoffice does the job, and I cant be bothered to invest more time to get MS office, 2016 edition 64 bit, or whatever would be applicable in my case, to work like before catalina.
thanks for the tips though.