In Bootcamp I am installing Windows 10. When I select choose ISO Image the USB that has the image shows in locations. When I select the image it opens up the folder of the ISO. It will not open in Bootcamp. I will have the choice to select from autorun.inf, boot folder, bootmgr, bootmgr.efi, efi folder, setup.exe, sources folder, support folder.
I have tried selecting several of these and some will open in bootcamp. But all I get is the error Need 54-bit Windows or 10 or later ISO file. I am sure the file is good I downloaded it from Microsoft and used both their installer and rufus to make 2 files. Both have same error.
I should also point out that I was running Windows 8.1 in  bootcamp and deleted it to do a fresh install of Windows 10. I did use bootacamp to delete the partition. This is on a Mac Pro 2013