I agree certainly with VLC, lightweight and pretty good at what it does!
I'm not aware of any process in place to get a free .iso image, I've got no idea how the Windows 10 download will come through, or whether you'll get an option to burn it to DVD too... I feel the same about it, I'd sooner use external media to install it, but I don't personally think Microsoft will give us that option!
EDIT: If this article is anything to go on, then yes, we will be able to clean install from a .iso! Yes, you’ll be able to do clean installs of the free Windows 10 upgrade | Ars Technica
It has to be an ISO of win 10 RTM, for the simple fact that if for (example) your HDD goes bad,how do you suppose to install Win 10 on your machine on a new HDD,it doesn't make sense otherwise,
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