Ok, from the picture you attached I have understood why your issues.
You are NOT on Mojave beta 4 build 18A336e, since in beta 4 the App Store's Preferences pane has slightly changed.
You haven't updated and are still on a previous beta Mojave, perhaps it's a beta 2 build 18A314k yours.
Anyway in your case try to disable from AppStore's Preferences "Automatic Updates" too.
OR when you will update to beta 4 re-try again and all the methods posted should 100% work.
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Agree, infact if you read well I've told to
dsfser that his Upload's freezing was due to that old PCIex Wifi card from a 2009 MBP so the card was from 2008/2009 and probably did not hold up that higher bandwidth especially in the Upload phase.
The 20Gbps server side Tokyo you are speaking, where I am located typically are used ETH cabled compliance I guess Cat.8 twisted pair or maybe other kinds of fiber like yours, and if you read carefully I suggested to that guy to use the ETH cable and it worked too. Cause ethernet of course through the copper/fiber cables can hold up much more bandwidth and better resistance to higher temperatures.
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Try the Corebrightness manual patch on thread page 87.