To: Steve Chambers and David Anderson,
Here is the process I used which led me to step 6. Everything worked perfectly. I restarted my Mac Mini and held down the option key. Mac HD and EFI HD appeared. I clicked on the EFI. The Windows logo or badge (the little boxes) appeared and it looked like everything was fine for about a minute, then the screen went black. The Mac Mini remains on but the screen is blank. When I talked about "Finder Ways", what I meant and should have said was the new process that David proposed to work around the need for a flash drive and load the Windows support folder and ISO Windows in the 16 GB partition, inside the Winstall volume.
(((Download the latest Windows 10 ISO file from Microsoft's website Download Windows 10 disk image (ISO file). Currently, this would be update 1909 (September 2019) .
Download the Windows support software. Open the Boot Camp Assistant app. From the menu bar, select Action-> Download Windows Support Software. By default, files should be downloaded to the WindowsSupport folder in your home folder. When the window below appears, enter your password then click on the Unlock button.
When finished, exit the Boot Camp wizard.
Connect the external player. Open the Disk Utility application. In the drop-down menu in the upper left corner of the Disk Utility application, make sure that Hide sidebar is not checked and Show all devices is checked, as shown below.
Highlight the external drive and select the Erase button. Enter the following information in the pop-up window, then click the Clear button.
When erasing is complete, click the Done button. With the external drive still highlighted, click the Partition button. Make the following changes in the order shown below.
Note: The size entered below must be large enough to create a volume that can contain Windows ISO and Windows Support Software files. The value of 16 GB should provide more than enough space. However, a smaller value can be replaced.
Click on the + button.
Enter a size of 16 GB.
Enter the name WINSTALL.
Select the ExFAT format.
The result should appear as shown below.
Click the Apply, Partition and Done buttons in the given order. When finished, exit the disk utility.
Using the Finder application, mount the Windows 10 ISO file and copy the content to the WINSTALL volume. Then copy the contents of the WindowsSupport folder to the WINSTALL volume. In your case, the result should appear as shown below.
Restart the Mac and immediately hold down the option key until the boot manager icons appear. Boot from the external drive by selecting the external drive icon labeled EFI Boot.
When a window similar to the one below appears, press the Shift key + F10 c)))
I really appreciate the opportunity to converse with all of you.
Thank you for everything you do!