I have installed Stardock Start 11 v2 After the installation of Windows 11
I have chosen the Windows 10 Start menu layout an it worked without any problem.
It worked flawlessly and after some fine tuning (couple of hours) my Windows 11 works extremely well.
I also have made a backup of the Stardock settings : might be handy ( I hope) in case a new Windows 11 update destroys things in (or the whole) Stardock Win10 start-menu again.
For now : extremely happy with Stardock Start 11 v2