OK, so I downloaded Firefox, downloaded the game files, and logged in and - yep, the log in screen stuck on 76% and that was that. Exactly the same as what happened when I tried to get a friend's kid into SHSO on his new laptop. So come on, I know some of you guys are way more computer-savvy than I am: is there no way that I can get into SHSO on my swanky new Windows 10 laptop?
As it is, my current laptop is starting to get a bit huffy-puffy when playing SHSO these days - half an hour and I have to log out for five minutes, or the game starts to become unreliable, not getting into missions, not being able to move zones, etc.