I had downloaded it from Microsoft onto the hard drive on my Mac. It is a 5.3 GB iso file, so I had formatted the USB thumb drive to exFAT since FAT32 couldn't handle that file size. The new computer wouldn't find the disc image after multiple tries, so I found a driver for the MacOS to create a NTFS format on the USB drive; that still didn't work. I then reformatted the USB drive to FAT32 and tried splitting the file into smaller pieces and reforming it on the drive by using the Terminal commands "split -b" and "cat". While reforming the iso file it stopped at 4.3 GB since that is the limit for FAT32.
Finally after all of that, I realized I needed to take the individual contents from the iso file and place them on the thumb drive; booted right up to the Windows install. Lesson learned, just buy the Microsoft USB thumb drive at the store.