Hi, Update on this problem!
I have been liaising with Stardock on this issue (as a problem ticket), and in the end they could not help me any more. So I still have the same problem.
Yes, I have installed the latest version of Start10, I have the latest Insider Preview (Creator's), I am operating Windows 10 Start menu in Full-screen mode as listed on the Setting menu and I am not operating in tablet mode.
Just in case it makes a difference - the machine is an HP/Compaq 8300 SFF; with an Intel Core i7 3770 @ 3.4GHZ and 16.00GB of DDR3 RAM
I have seen Launch on the Start menu once when booting up, just as the Start menu came up, but it disappeared as quickly as it showed.
I have also updated my screen driver to the latest version - Intel HD Graphics 4000.
I have installed a new version of Windows 10-64 (NOT Insider Preview) on another disk and installed Launch and Start 10 on it and I still cannot see it on the Start Menu - I cannot understand why!.