Hey guys! So now I finally enrolled my MacBook Air 13" mid 2013 for Apple's Public Beta program. After installing the downloaded pkg file, the Feedback Assistant app and the Mac App Store opened automatically but nothing happened. In the Mac App Store no updates available. Why? I tried to restart my computer and I tried from the terminal using the command "softwareupdate -i -a". Actually I'm using the final version of the 10.13.4. What could I do? Thank you!