May be paranoid, but am leery about DL Win 10 anything on my hard drive, would like to keep any such a parallel operation.
Been free of 10 nagware until now and want to stay that way.
Google Media Creation Tool and download and run it.
Then you can either download a Win10 iso, or download it direct to a 4GB USB stick.
The iso is about 3.3 GB in size.