Years ago we were able to go to a store and buy an Operating System such as Windows for our computers. There are also a lot of FREE Operating Systems that you can download and install onto your computer. Today we must download what is known as an ISO. This is a packaged Operating System that we need to place onto a flash drive and then install from that device. The software I use for this task is Rufus which is a FREE application. I would suggest if you want to learn to use Rufus please search for it on YouTube.