You can reserve your free upgrade in the Get Windows 10 App. Once you reserve, Windows 10 will download when available, and you can cancel your reservation at any time.*
Click on the small Windows icon found at the right end of the taskbar. If you don’t see it, visit our Q&A page for more info.
Click “Reserve your free upgrade” in the app window.
Enter your email if you want a confirmation of this reservation.
All set. There’s no obligation and you can cancel your reservation at any time.