themidge. Hang on a minute. In fact, hang on a lot of minutes cos I'm sure there's something wrong with the logic, but I'm darned if I can bring it into focus.
In the above
site we have a clear statement that there's no need to put in a key.
As stressed, it says if the ISO data is loaded onto a W10 machine there's a danger of immediate activity which could screw that machine up. (via Temp Files) But, it's safe to carry out the download onto a W7 machine and take that presumably prepared ISO to a W10 machine which can have a formatted drive C.
Are you saying the key is totally provided by MS records of hardware, or is the key left in some exotic hiding place? Yep, my brain cell is also failing.