Drayth wrote on Jul 29, 2015, 20:48:
From: Win 10 FAQ
"Once you’ve upgraded to Windows 10 using the free upgrade offer, you will be able to reinstall, including a clean install, on the same device. You won’t need a product key for re-activations on the same hardware. If you make a meaningful change to your hardware, you may need to contact customer support to help with activation. You’ll also be able to create your own installation media like a USB drive or DVD, and use that to upgrade your device or reinstall after you’ve upgraded. "
If you're using the ISO I've read that running the setup from within your current OS takes care of the needing a Win 10 key during install (wouldn't mind someone confirming that).
After you get Win 10 installed you make a recovery edition to a USB or DVD that has your product key embedded in it and you can do a clean install from there and still not have to enter a key (so using any method you have to do an express install the first time).
You can get your Win 10 key once it's loaded using SIW and just use the key if you ever change enough hardware that it asks for it during install.
Also if you use a Win 7 / 8.1 home edition to run the Win 10 installer you get the home edition. Use a pro edition and you get Win 10 pro. Got that info from an official MS page somewhere.
That sucks if I have to install twice to get a clean install. Even worse, when I get around to building a new system, I'll have to install Win7, upgrade to Win10 then re-install Win10. SIW discontinued the free version and the last free version doesn't work on Win8/10, so unless there is another way to get the license key, I have to keep backups of install media for each system.
"The only way anyone can live in peace is if they're prepared to forgive." - The Doctor