Thanks, I have tried several ways to instal the Outlook that works, but it has failed every time, telling me that I need to uninstall the 2024 Office first.

I have not done this because I'm concerned that if I do that, and install Outlook classic, when I come to re-install 2024, I'm going to have problems activating it. -- Or even worse, telling me that I have to uninstall classic outlook first.