MYOB V15 Changing Email Platform

With Microsoft recently changing the Modern Authentication Methods and removing the ability to now never be able to use Outlook 2007 again, I've installed the new Outlook 2024.

Being that V15 is old, how can I now change when I send an email that email is not sent via Outlook 2007 but the new Outlook 2024 version?

Ive changed the default settings in Default apps of Windows 11 to the new Outlook, but the email still goes to 2007.

I then proceeded to uninstall 2007 to stop it going there, but now get the error of a missing MAPI32.dll , the MYOB software freezes for about 10-15seconds then shuts down.

Do I need to edit a registry key to change from Outlook 2007 to Outlook 2024?

Any help to this issue would be greatly appreciated. 

Cheers Mark