If you assigned the seat to an email that is already a Trimble ID, they can go straight to the downloads page to get the installer:
I looked at your 8 users, 7 look ok, and should be able to download, install, and sign into SketchUp, and their subscription should work. For the user with the initials ‘ks’, they are having password issues. I will resend a password reset, but in a way that usually seems to get through ok.
I wrote a post once, and about the typical reasons that the confirmation and password emails don’t get through. For interest you could see if any of what I wrote applies to your users.