Windows 10 Clean install tutorial This tutorial is intended to help you, step by step, to perform a clean install of Windows version 10, build 1709 or newer but can be equally applied to earlier installer versions which may simply lack some of the Cortana assisted settings screens but should...
I installed 10 on my new build earlier this year and skipped the activation and all the junk stuff until I got it set up the way I wanted, then I bought a key and activated it. I also upgraded my old Core 2 duo computer from 2010 from windows 7 to 10 this year for free.
I have used my gaming computer with an unactivated Windows 10 (retail sellers are price gouging here, so nobody buys retail from a store in this country, if they have OEM on their PC's, that's it) for at least two years. Nothing except an "Activate Windows" watermark, and no customization options (which you can do some using registry), not even the kind of nagging Windows loves to do once in a while by showing a huge screen at every boot or something. It's definitely up to your ethics to buy it after using, but we recommend so.
Also, if you have a computer with an activated Windows 7/8/8.1, you can upgrade that PC to Windows 10 for free.