I'm getting the dreaded "Something happened - Windows installation failed" error on my 2015 Macbook. I've tried to upgrade from fully updated (and legally activated) Win 8.1. I tried Windows Update, Media Creation Tool with the upgrade option and separate media creation using a USB stick, but all to no avail. I've changed the language and regionale to US English. Has anyone had similar problems and managed to do it, or any other ideas of what I could try?