Is the setup having problems or something? I've been trying this for the last 2 days. And before anyone asks, yes, I am using a legit Windows 8.1 Pro System Builder key I bought from Amazon.
win 8.1 iso Go here {Upgrade Windows with only a product key} google it can not post link scroll down and click on both 'Install Windows 8' and 'Install Windows 8.1' Run the Windows 8 setup and enter your retail Windows 8 key, click next and when i begins downloading, STOP it! Exit setup. Now run the the Windows 8.1 setup. It will produce and error. Exit and then run Windows 8.1 setup again. It should now be downloading the Windows 8.1 ISO. Afterwards you can save it as an ISO or create the USB media immediately. can not post link failkee thread