Hi Mark,
Yes I'd say your version was the latest update (7 February, 2023) I've no idea why Magix would send you a nag about a 'new' update. I'm a Xara Pro+ user so I don't have Magix 19 version so I wouldn't get this message you have. According to Magixs Xara page the last update was March 22. Perhaps v19 users on TG will add to this. Any screengrabs of this offer peeps?