I've just seen on the MS site, that downloading a clean OS to say, DVD or USB stick could render existing Temp files useless.
I'd thought of taking advantage of changing to 64bit since it was a free 'upgrade'. It seems I'd have to do it on my W7 laptop to be safe.
I've just thought of another trap. It seems one does not need the key to put the new 10 in. So somewhere, it's embedded in the system.
BUT, the ISO has to be created on another machine, so what key will the ISO be allocated?
Important
To upgrade for free, select the Upgrade now option at the top of this page.
We recommend using the media creation tool on a PC running Windows 7 or Windows 8.1. If you run this tool on a PC running Windows 10, it can overwrite temporary files that are needed if you ever want to go back to your previous operating system.
https://www.microsoft.com/en-gb/soft...load/windows10