Download an installer (.exe) from the download page. The FreeCAD installers should work on any Windows version starting from Windows 7.
Accept the terms of the LGPL license; this will be one of the few cases where you can really, safely click the "accept" button without reading the text. No hidden clauses:
You can leave the default path here, or change it if you wish:
Make sure to check all the components to install:
That’s it. The installation is now complete and you can start exploring the capabilities of FreeCAD.