Zwift still updating

I’ve installed Zwift on my laptop and created my account. However when I log in and click Let’s Go I just get a progression bar which says “82 minutes remaining” or similar and goes no further. Although it has now moved but only a little bit. It doesn’t take me to the Licence Agreement screen. Also after the install I had a message re: ‘mutationobserver’ is undefined and I was asked if I wanted to keep running the script but it didn’t seem to matter if I selected Yes or No.
I’ve attached a screenshot