Thank you very very much.
That FIXED the problem, it seems.
Ran that and fxed the redistributables and then it ran and created the Witcher 3 directory in Documents and then I copied by savedgames folder and the other loose files and it worked like a charm --- I think :)
I just fired it up and saw it worked and then quit to come back here and say thanks.
Support tries to help but being on the other side of the Earth makes talking to them via email like a science fiction story where communications take days to go between planets etc. etc
The great people in these forums usually can produce an answer faster. :)
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Arizona-Willie: Has anyone had success installing Witcher 3 onto a Windows 10 drive --- NOT installing Windows 10 over a Windows 8.1 installation that already has Witcher 3 installed, but on a FRESH copy of Windows 10 ver 240 ( RTM )?
GoatBoy: You may want to try this:
after installing the game, go to the folder where you installed Witcher 3 (Usually, GOG games/The Witcher 3: Wild Hunt/), open the folder _redist, then MSVC2012_x64 and launch vcredist_x64.
After this, launch Witcher 3 normally :)
GoatBoy: