Please accept my apologies for not getting back sooner however I have been locked out of the forum on numerous occasions with the error that I have entered the wrong password (which I haven't). Even ForumAdmin issued me with a new password which also resulted in my being locked out. Just done a password reset again to get access but don't know how long it will last based on past experience.
Thanks Pixey for your info. Unfortunately it did not help. I checked to see if I had 'C:\Users\<username>\AppData\Local\Temp\MSIxxxxxx.log'. and there was nothing there in "Temp"
Thanks also to IHaveNoName. I am running a Win 10 Pro (64 bit) version 1803.17134.376 which is the very latest prior to the withdrawn version 1809. The version of .net is the very latest 4.7. so no problems there I assume.
Thanks also to Rick Brewster. It is a clean install of Windows 10 Pro as above from the MS Download. Winver shows the version as above. I had already actioned the Update facility until no further updates were available.
So I am still unable to install the program.
I do appreciate all your help.