I have tried five times to install Win 10 onto a Win 7 laptop with the same scenario each time. I have searched the internet for a workaround and none of them have worked, apart from which - why should you have to go through all of these workarounds anyway. If Microsoft advise that your PC is Win 10 updatable then surely that should be the case. I for one will not be updating any of my other PC's until a much later date when PERHAPS these problems are sorted.
What is ransomware and how do I protect my PC from Petya?