Davinci 20 update not working

I've got this problem. I've been using Davinci 19 for quite some time now, and I wanted to update to Davinci 20 to try out new features. I downloaded the newest version, and as I try to open the installer, it says I have nothing left to download. However, as I try to open it up, it still boots up Davinci 19. I don't know whether I did sth wrong or how I can boot up Davinci 20. Can somebody help, pls?