Microsoft isn't forcing anyone to purchase anything. For years changing from one OS to the next has been free,
Now, to go back to Win 10. Use your stand-alone usb Win 10. Format your hard drive and reinstall Win 10. Then enter your key.
I know for me all the key commands for Cut, Copy, Paste, and Delete have worked just fine since Windows 3.1. And I don't have to go to page two for anything, I have clearly understood icons at the bottom of my page one, when I right mouse click on something.