antdude
That happened to me too when I installed the plug-ins v4.73 installer first, so I just then installed the regular v4.73 one over the top and that gave me the new v4.73 number on both the Start Menu and in the Help–>About in the app. After that just in case I then redid the plug-ins installer and everything remained the same.
BTW, Thunderbird v145.0 is finally available. I guess I shouldn’t complain about free stuff! 🤔