Hi all, just need to tell someone about this. I have just completed my first ever build and so far it has gone well. Then after installing my new copy of Windows 10 (retail copy via Amazon UK Market Place) the Product Key is invalid. Tried several times but same result. I contacted the seller via Amazon UK who said that he wanted me to send him photos of the product key that came with the USB. I did and he replied that he has spoken to M'soft and they are investigating, meanwhile they have sent him a new Product Key which he has emailed to me. Guess what, used it and M'soft says it is invalid as it has been used on another device so will not activate my copy of Windows. Have emailed seller to say I'm not happy and will contact Amazon for return & refund (I paid £87 = $118). I guess it depends on how software refunds are gauged by Amazon as to their response. Perhaps I should now go through M'soft to pay for and download W10 and get a working key/digital licence. I'm beyond angry now, I paid a good price to prevent this type of problem.
Sorry for rant