In fact, the process will not get underway without the product key being entered. (I had about 186GB of data on my 256GB SSD).īy the way, I used the product Key of my EXISTING Windows 8.0 when asked to 'enter your product key' very early in the install process. It took about 25 minutes (including 4 re-boots). I then sat back and let the proves run to completion. When asked whether I wanted to do a clean install or keep all my apps and data, I opted for the latter. I ran the upgrade by booting from the DVD (ISO).
