I just looked this up and found out that Rufus can do it. I tested it and it appeared to work. Just note that once you hit the "Download" button that the "Download ISO image" dialog may be behind the main Rufus window, it was for me.
Pic from my test machine:
19H2 is 1909.
I was able to copy the link and download the ISO in a browser, although I didn't finish it. The link goes to software-download.microsoft.com, so it's official. The filename was: Win10_1909_EnglishInternational_x64.iso
Full instructions here:
View: https://www.youtube.com/watch?v=crEmxCFew88