Free upgrade to Windows 10 from Windows 7

Our laptop has a licensed Windows 7, and we did an upgrade to Windows 10. It is great.

1. Before the upgrade, make sure you have made all the necessary backup of your Windows 7 (OS and Data).
2. Do the upgrade. Get the executable Windows10Upgrade from Microsoft https://www.microsoft.com/en-ca/software-download/windows10. Run it. It checks if the hardware acceptable or not. The upgrade may hung at the point showing 99%. We uninstalled all the software we installed, especially anti-virus software, VPN software, ... . Budget yourself about 10 hours for this upgrade.
3. After the upgrade, perform a system backup (about 65 GB, in size, in my case), burn a recovery disk of Windows 10, and burn a Windows 10 iso for future re-installation.