Any activated copy of 7/8/8.1/10IP will remain activated after an update via ISO (from within the previous OS).
[QUOTE=sgage;283967]But first you'll want to make an image of your 8.1 system to put back on to catch the official upgrade/QUOTE]
Absolutely, even if you are not a tinkerer. However, I am a tinkerer with a few spare SSD's. I clone and "experiment" with the clones. Have upgraded Windows 7 and 8.1 using this method as well as clean installs.
WarningLets stop with the bickering shall we.