Not able to install 1.15.0.8, even if I'm enrolled for Minecraft RTX.

I have the following environment:

SW:   Windows 10 Pro 1909 OS build 18363.778

          Nvidia GPU driver version: 445.87

HW:  CPU: Intel I5-9600k, RAM: 16GB, GPU: Nvidia 2060 Super

 

I am enrolled for "Minecraft Windows 10 RTX Beta".

Every time when I uninstall and install Minecraft from Microsoft Store I get the version: 1.16.0.57, which is the beta one but without RTX.

I have also an internal GPU (Intel 630) which I disabled as well, but no effect. I got no version of Minecraft for RTX.

You can see all my attached 

Please help me to install 1.15.0.8 RTX beta!