You right on in the last message, as long as the Op activate it in Windows 7 before he upgrades to Windows 10.
I'm just wondering though if he will be able to. That laptop motherboard is registered to that Windows 10 Home version.
About a year ago I posted a message on the Microsoft Community Forum about if I ever lost my Hard drive, if I would be able get 10 pro back on the new drive. They told me no problem, it only registers the motherboard. I upgrade to Windows 10 through the Windows 8.1 Pro that I had on my computer. I originally bought the builders version of Windows 8 Pro when it first game out.