Windows 10 Reset
Also, if you use Windows Media Creation tool in the future, you are good to go.
What I mean, is say you want you to re-install. Use Windows Media Creation tool to setup a disk or flash drive, boot from it, and run the setup to do a clean install. At some point it will ask you for the product key. You'll have the option to skip it. Do so, when Windows 10 will be fully setup and on your desktop, do your Windows updates. Once the Windows updates are done, restart your system, and you'll notice that Windows 10 will be activated.
How come? When you upgrade to Windows 10, it generates an ID from your hardware configurations that is specific to you, and uses that as your product key which is stored on Microsoft servers. As long as you don't change your hardware too much (motherboard and CPU), you should be good in the future when the free upgrade offer ends.

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