The refurb I bought from Woot had an enterprise Windows 7 key and was not eligible for the free Win10 upgrade. Also would not upgrade from a bootable usb drive.
Hi there. All refurbishers are required to affix (Win7) or install (Win8) a new license key when they reimage computers.
You might look for a second sticker on your computer.
MS would not upgrade to Win10 with the sticker code.
my smartphone has more memory… awesome