HertogJan: Download the offline installers and use those.
Start the game by using ...\bin\x64\witcher3.exe"
Thank you for your reply, HertogJan.
As usual I forgot to mention that I was talking about offline instalation. That's how I always download my GOG games. I didn't know about the ...\bin\x64\... executer. I can't remember if the instalation shortcut was already pointing there or another executer in the folders.
But that's a great tip. Thank you. I'm very tempted to re-buy the game and try it that way.
Unfortunately, I just discovered that my bank decided to take it's annual account commission today, and left with no money to spare. So, the situation is all academic now.
Guess there's always Christmas sales. ^_^ Although if it's gonna be a toss between that and 'Uncharted', 'Uncharted' will most likely win.
But thanks again. I'm saving that tip for when the time comes. ^_^