I guess I found the solution. In my case, I had the automatic update in the IniManager "on". So it was already updated when I looked at the screen, wich looked identical to the above screenshot. Just open the inibuilds-aircraft-a350-folder in the MSFS 2020 community folder and look into the Manifest.json file with the editor. There you'll find the actual version no.
in other words, it looks as if you have alreday updated the product (as it was in my case).