If you want to do a new installation of Windows 10, then you can download the Windows 10 Windows Media Creation tool. The media creation tool acts as a Windows 10 download tool plus a bootable USB builder. You can perform a clean install and upgrade your current installation. You can easily access any version of Windows 10 from this Microsoft download link. The problem with this link is that if you open the link on a Windows 10 PC, it automatically detects and forces the user to download the media creation tool first.