I did not need it after, the computer went back to the old version ok, but it was good to have on a usb stick just in case.
My own machine is playing up now, for some reason it came up with a blue screen of death and I had to reset the bios, ok the UEFI, but I have no idea why, I set it back up to what it should be and Windows still did not boot, so I had to reinstall from a image file.
Maybe this machine is at the end of it's life, I was hoping for it to last until June.
Maybe I should go Mac.
Desktop machine now powered by windows 8.1 pro 64bit, no dreaded metro, laptop by Linux