Gloria said she tried to upgrade to Windows 10 a few years ago, but it wouldn't let her. Leo says that things have changed, and Microsoft really wants users to move to Windows 10. So he recommends trying again. Here's an article how - https://www.zdnet.com/article/heres-how-you-can-still-get-a-free-windows-10-upgrade/
You want to download the Windows 10 installer and run it. It'll automatically authenticate it and install Windows 10 on top of Windows 7. It should work just fine and you'll be an officially entitled Windows 10 user.