I have a Dell laptop with Windows 8.1 OEM 64 bit installed that came with Laptop from DELL. I created an ISO for Win10 Home 64 bit using the media creation tool. Now if I run the setup from DVD created from iso within Windows 8.1, it asks me a product key with no skip option. It doesn't, of course, accepts the win 8.1 key extracted from BIOS as the key is not upgraded yet as a Win 10 key. If I boot from the DVD created by ISO and selct the upgrade option it asks me to go to windows and do it from there (previous step) What to do, please suggest. My windows is genuine 8.1.