In addition to the ISO file, you also need a USB flash drive at least 8 GB in size. From that same File Explorer window, you can also create bootable Windows 10 installation media on a USB flash drive. Ready for Windows 10 April 2018 Update? How to take controlĪfter the download is complete, you can double-click the ISO file to mount it as a virtual DVD drive and run Setup directly from the mounted drive.