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 64-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 Bootcamp to delete the partition. This is on a Mac Pro 2013
Best Answer
You appear to have created USB flash drive Windows 10 installers by using both rufus and and the Microsoft media creation tool. Both of these methods bypass the use of the Boot Camp Assistant. You are suppose to use the Boot Camp Assistant to copy the files to the USB flash drive.
You should go to this website from Microsoft and download Window 10. The last time I checked, the October 2018 update (1809) will not work with BootCamp. This only applies to older Macs that use a flash drive to install Windows. This includes your Mac. So you will probably want to download the April 2018 update (1803).
If you have High Sierra or Mojave installed on your Mac, then you can also create the USB flash drive installer without using the Boot Camp Assistant. The instructions are given here.