I am trying to make a windows 8.1 90 day trial, bootable USB drive for my newly built PC to see if like the operating system I have followed this video - https://www.youtube.com/watch?v=NT0KFR09Svc. I downloaded the ISO from https://www.microsoft.com/en-us/evalcenter/evaluate-windows-8-1-enterprise. When I try select it in the Windows USB tool it says it s a invalid ISO. I followed Linus's steps exactly but it dosent work. Any solutions or help would be appreciated. Thanks.