So I'm not tech savy at all, and called Apple Store to see if they sell windows 10 and how I can use boot camp. He told me to google "windows 10 iso" and I can get it for free. Is this free for someone who's upgrading from an older version of Windows? (I don't have any windows products) or do I have to pay the $150? Sounds like it's too good to be true, and in that case it usually is.