Just dragging this back up as I've just got round to looking at it & my VAIO is telling me I can't update it until October/November depending on my system. As it's originally on Windows 8, which I like, but has been updated to 8.1.
I'm sticking with Windows 8 on my desktop, I like it and I've never had a problem with it. I put Windows 10 on my laptop on Wednesday night, I requested it only about a week before that - had no problem downloading and installing, on first cursory inspection of it I think it looks ok. It's odd how they're telling you Oct/Nov and I got it in barely a week?