Why I am asked to update?

I downloaded and installed the latest version of DaVinci Resolve 20 Public Beta 4. But when I started Resolve, I got notification that an update is available!

I think I am sure I installed B4:

Here is a screenshot for About:

Any idea what is going on?

I think I am sure I installed B4:

Here is a screenshot for About:

Any idea what is going on?