If u still are running windows 7 like I was till a few weeks ago, there are still ways to upgrade to Windows 10 for free!
The way I did it was following this guide:
https://www.digitaltrends.com/computing/how-to-get-windows-10-for-free/You just have to download one program called: Winkeyfinder (this is the one I used there are many other programs that work but this one worked for me and was easy to use, just google to download) just to make sure you have your Windows key saved.
And just follow the simple steps on the webpage to upgrade your Windows 7 to 10 for free!