If you want to get ISO for Windows 7, you should checkout my older post. It should be noted that Windows 8.1 can’t be installed or download via Windows update but you can only get that by product keys. You will find Zip file containing 32 bit and 64 bit ISO. Please click the button below to get the 100% working, clean and safe ISO file for your Windows operating system. It was available for public on August 2013. Windows 8 Pro also called as Windows 8.1 is the version from NT family of operating system.