Paramount plus app not working with an X1 box

Hi there, tons of people including myself have issues with the Paramount Plus app streaming on Xfinity. Yes the actual streaming app, not the channel. We have a compatible box, but there is no way to upgrade the paramount+ app, and no way to delete it and re-download. Like everyone, it buffers too long as it's loading shows and it errors out, sometimes playing the show behind the error box. You have to try like 7 times before maybe it works. I have already tried logging in/out in the app settings, didn't work. I now am forced to use a fire stick to stream instead which is not convenient when we spend what we do for cable. Please provide working steps to get the latest version of the app and what is the latest version (the one we currently have is show 4.17.3 but the livestream app said it's in version 8! This must be old!

Why is there no way to update in the Paramount+ settings.) Also how can we just delete and re-install this app. It's not listed with Showtime, and other channels like that on my Xfinity account page, there is no link to the paramount+ app. Their website has no helpful info either except saying we must have an outdated version.