I have filed a bug report about this on January 15. Over a month later haven't got any response, so yesterday, February 24, I chatted with support. I was escalated to a clueless higher level person 3 times and finally transferred over a phone support, who also called the iTunes group to see if this is a regional issue (eg having a US account but currently in the EU). I told them this is not the first time I am in the EU with Mojave and downloads worked fine, so this is NOT a regional/locale issue.
I cannot believe how many clueless people are there at Apple. Granted, they are very nice and polite and trying to be helpful, but aside from how to turn on your computer, they are clearly no help in more involved cases.
One of them said he checked my account in the backend side of things and all was well, so the issue is with my system.
So I thought why not do a clean install of 10.14.6. That should alleviate the problem. Nope. First I just installed the original 10.14.6 package with no updates. No luck. Apps are still not getting downloaded, just the usual spinning cursor is visible forever. Then I installed the latest updates and security patches. Still nothing.
I have noticed from time to time, that when Apple releases a major version, the App Store messes up with the downloads, but so far this issue never lasted this long.
So now here I am with a cleanly installed OS and cannot put any apps on it from the app store. I have no understanding that why Apple has not figured this out in the past, since it happened before as well.
It seemed to me that the only thing support does is trying push people to install their latest OS. They are nothing but salesmen. The phone support person screen shared with me and checked basic things like what is my model and how much free space I have. Right, because it is not something you can just ASK, you need to SCREENSHARE to find it out!!! I am extremely furious at the moment.
Submitted ANOTHER bug report of this same issue yesterday - like that will make a difference - but I don't care. This is really insane!
I am sure you guys seen this...
https://support.itsolver.net/hc/en-...36-macOS-Mojave-won-t-download-from-App-Store
this...
https://apple.stackexchange.com/que...r-500-com-apple-commerce-client/352847#352847
and this...
https://apple.stackexchange.com/questions/350669/cant-install-updates-from-macos-app-store
None of them helps.