Once you have the ISO file, it is essentially a digital disc. You cannot simply copy it to a USB drive and expect it to install. You need to "burn" the image to the media.
Here’s a little trick: you can install Windows 8.1 from the ISO and during setup. Just click “I don’t have a product key.” It’ll install in trial mode (30–90 days, depending on edition). That’s fine for testing, but not for long-term use. windows 8.1 iso
Released in 2013, Windows 8.1 was the "big patch" designed to fix these grievances. It brought back the Start Button, allowed users to boot directly to the desktop, and improved multitasking. For many enthusiasts, the Windows 8.1 ISO Once you have the ISO file, it is essentially a digital disc