A friend of mine posed a question to me yesterday I didn't have an easy answer for. What's it going to take to upgrade to Win10? I started looking at installation media for Win10 and found it to be really confusing. Pricing all the way from a few dollars to 200 dollars and there doesn't seem to be anyway of verifying what you will get. I read a review where a purchaser on Amazon bought a installation disk and was told the product key is only valid in the UK. How is it possible to buy Win10 on eBay for less than $5 and be legit? Dozens of sellers.