even if older versions are installed on an older machine, most if not all will fail to function/open because the update server is no longer available. For example, I tried to open the desktop apps for 2018 through 2020. All had the latest updates at the time I last used them. I was asked for the license code which I entered. They still failed to function. Some have posted that they got certain earlier years to function. What I'm saying is don't count on getting any but 2021-2024 to function.
