> My friend said "how much did you pay for Windows 10." I said "nothing, it's free update." then he said "There you go." You paid for the original system that

> My friend said "how much did you pay for Windows 10." I said "nothing, it's free update." then he said "There you go." You paid for the original system that you updated from. If you are outside the 30-day window (which you are, because the free offer is over for more than 30 days), you cannot go back to the old system. So you didn't get the system for free, you exchanged it for the old one. Just the act of the exchange was free, which does not make the system free. Newly bought Windows 10 licenses are not free either.