You'd think by now that organizations wouldn't send out a 'here's an app, now click this link to get a download text' messages. We filter the F out of those here.
It appears to be the Clear App by Alclear LLC, which you can find on your app store w/o going through the 'trust us' process.
(I'm fairly sure it's fine, but it's not a great way to get everyone the message, particularly if there's a lot of screening going on against suspicious links)