gone back to old version of zoom how do i go back to latest version

I have logged into my paid for version of zoom this morning and it has gone back to an old version in the desktop. i have lost the ability to blur my background, and different date formats now on screen - also when I try to talk on the zoom live chat it says my account does not have access to live chat - and yet i have used it before.

How do I get my settings back to the latest version and get this resolved?