Page 966 - Windows 10 May 2019 Update The Missing Manual: The Book That Should Have Been in the Box

Figure A-1. Top: Use the buttons on this screen to indicate whether you want a clean installation or
an upgrade installation.

Bottom: You have to install Windows onto its own partition.

Here, instead, you should choose “Custom: Install Windows only
(advanced).” That’s the clean-install option.

From there, you proceed to the “Where do you want to install Windows?”

screen.