I am not sure if Microsoft has corrected the mistake of not delivering totally polished off ISOs day one release of the 1903 May release of Windows 10 through the Windows Media Tool but it has definitely been an issue as I experienced it and had talked directly to a Microsoft Tech about it. A final release of Windows 10 x64 1903 build 18362.30 MDSN ISO weighs in at 4.8 gigabytes. The ISO I was getting through the tool wasn`t even close to that. I ended up getting a true MDSN ISO from another location but I was wondering if anyone else was experiencing the same issues. I ISO I got through the tool was crashing on fresh installs saying files were missing in the install and would not let me continue, The tech I spoke to put in a case order to have it addressed but I`m not sure if it has been as of yet. Now this is only an issue I noticed with the media tool as I have not experienced this anywhere else.