Interesting. Could you switch to the Stable channel? The 2018.4 CE is released as per our banner.
I think your issue is simply due to the fact that there is currently no running Beta 
(which is weird, because one would think that you would still get upgraded to Stable release )
We will investigate.
ashokkarale
jast1631
Shruthika_r
justindward
Gaurav_Malhotra