No it’s not a scam, there’s a discussion of the webinar here on the forum:
https://www.survivefrance.com/t/moving-to-france-from-the-uk-webinar-17-october-1800-bst/
The page that’s linked to is a standard Zoom meeting sign-up page - I was able to register just now with no problem.
Maybe you have some AV or security software that’s blocking it - or try in a different browser, perhaps on a computer if you used a phone?