This is the second time this has happened. I tried to update the thrive visual editor with the WPMU DEV dashboard.
It gave me the notifications saying something like the site hasn't responded, it may still be updating.
Anyway when logging in to my WP dashboard thrive visual editor is missing. I posted a support ticket about this before, I ended up deleting the folder in file manager then reinstalling the thrive plugin.
Not sure how this is happening, I can fix it on my own but I wanted to bring it to your attention.