Strange upgrade to 10 pro

I had installed win 10 home originally.
I don't remember well, I was on EDGE (It did not show that message on other browsers), and I wrote, Howto upgrade to windows 10 pro
Something like that appeared.

But instead of being on the left with the message, upgrade to win 10 pro, it have a blue icon on the right that said INSTALL.
I clicked it and after a while, it make me reboot and I had windows 10 pro.

Anyone know what happened?

I'd guess the Win10 install picked up on an earlier install of Win7 or Win8/8.1 Pro. As long as it is Activated properly and working I'd just set back and enjoy it, the Pro version has more than most consumers will need.